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Convertible trunk mounting - screw locations
#1
Need some info on the differences of 71-3 trunk mounting screw locations.

The trunk horns have plates inside with tacked nuts that align to secure the trunk.
My friend's car has three holes on one horn and two on the other. (not sure which but I'll find out)

He has a new repro trunk lid and the holes are not lining up.  Looks like we will be required to drill some holes in the inner lid to attach. 

So I'd like to ask if you own a convertible - please take a pic of how your screws attach to these horns.  For 1973 they attach on the side using two farthest outboard holes seem to be correct.  Some attach from the bottom??? (1972?)   Then others attach on the side using the top and next hole down (1971?).  Please include build date of your car.   These horns are welded so I doubt they get swapped much.

Now that I look at this a little more closely - I realize someone could take the plates out of one horn and place it in another.  So that type of swap could happen relatively easy.  So I guess I'm looking for very original cars to compare.  Smile

Here is a pic of a 71 I found online.

.jpg   1971 convertible trunk.jpg (Size: 41.9 KB / Downloads: 101)

Thanks!

Ray

1971 Boss 351  
1972 Q code 4 speed convertible 
1971 Mustang Sportsroof  351-2V FMX 
1973 Mach 1 (parts car)
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#2
(05-13-2019, 11:04 AM)Boss1Ray Wrote: Need some info on the differences of 71-3 trunk mounting screw locations.

The trunk horns have plates inside with tacked nuts that align to secure the trunk.
My friend's car has three holes on one horn and two on the other. (not sure which but I'll find out)

He has a new repro trunk lid and the holes are not lining up.  Looks like we will be required to drill some holes in the inner lid to attach. 

So I'd like to ask if you own a convertible - please take a pic of how your screws attach to these horns.  For 1973 they attach on the side using two farthest outboard holes seem to be correct.  Some attach from the bottom??? (1972?)   Then others attach on the side using the top and next hole down (1971?).  Please include build date of your car.   These horns are welded so I doubt they get swapped much.

Now that I look at this a little more closely - I realize someone could take the plates out of one horn and place it in another.  So that type of swap could happen relatively easy.  So I guess I'm looking for very original cars to compare.  Smile

Here is a pic of a 71 I found online.


Thanks!

Ray

Ray...I can't figure out what you need? Have no idea what a horn is in the trunk? Happy to take a pic but don't know what your looking for.

Jeff

Jeff
1972 Q Code Convertible
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#3
I believe he may be referring to the bracket the decklid mounts to. The brackets that are attached to the underside of the header panel between the trunk and convertible top well. I have pictures of the untouched 73 vert on a different computer. I will respond tomorrow with those.

BKDunha
72 Mach 1 H-Code (Concourse driven restoration)
67 S-Code Factory GT with 4-Spd

68 Mercury Cyclone (Pro-Street project)
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#4
(05-13-2019, 07:59 PM)bkdunha Wrote: I believe he may be referring to the bracket the decklid mounts to. The brackets that are attached to the underside of the header panel between the trunk and convertible top well. I have pictures of the untouched 73 vert on a different computer. I will respond tomorrow with those.

100% correct.  Trunk hinge/bracket Thanks, Brian!

Coupe/conv ones have square tube end with bolt plates slid inside.  Some years bolted up from side using different holes in square tube end and others from the bottom.

   

One example of bolt plate. 

   

Ray

1971 Boss 351  
1972 Q code 4 speed convertible 
1971 Mustang Sportsroof  351-2V FMX 
1973 Mach 1 (parts car)
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#5
Ray, I went through my pictures of the untouched 73 and I do not have any of the underside of the decklid. Sorry I could not be of more help.

BKDunha
72 Mach 1 H-Code (Concourse driven restoration)
67 S-Code Factory GT with 4-Spd

68 Mercury Cyclone (Pro-Street project)
[+] 1 user Likes bkdunha's post
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#6
Ray,

My 1973 June built vert has two mounting holes on the side with the brackets you posted previously. The brackets from 69-70 are very similar and will work on 73. I don't think 71 and 72 are any different. I believe there is a difference with the way the key lock cylinder attaches to the lid on 73s compared to previous years. I had bought an original trunk lid from a 71 or 72 vert/coupe and after painting it, I notice that there was no slot cut out in the bottom of the lid to slide the key cylinder fastener clip into. I had to carefully cut the slot with a dremel to mount the trunk key cylinder. Not sure if the aftermarket trunks have the slot or not. I just mention it so you can check now before you have to cut it later as I did. I can get you the location and dimensions of the slot if you need it.

[Image: 71-73-Mustang-Coupe-Convert-Trunk-Lid-Ad...Plates.jpg]

[Image: DSC-0933x.jpg]

[Image: 20161209-223240x.jpg]

[Image: DSC-0270.jpg]
....
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#7
April 72 build...


[Image: IMG-2563.jpg]

Jeff
1972 Q Code Convertible
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#8
Ok Ray sent me link to this post in PM. I have 2 1973 and 3 1972 convertibles and the trunks all mount to the hinge the same way bolts from side with the clip in nut plate inside the tube.
I believe the mount for the lock was a change I think the 71 was the odd ball there and also had the Mustang letter across the back of the lid.
Here is my 72 Q and some of a 72 crashed vert. I cut the filler out to go in the Q was much better than the one in it. I think they are all the same but I have not 71 to look at.
[Image: 100-2872.jpg]

[Image: 100-2873.jpg]

[Image: 100-3366.jpg]


When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
[+] 1 user Likes Carolina_Mountain_Mustangs's post
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