What are the differences between these two timing pointers

[mikepasquale1]

The blue one is the one installed on my 73 mach 1 which has a 351w. The 351w i have has a 72 date code and the pointer is mounted passenger side. Do i have the right pointer? Were there 2 different designs?

[Tnfastbk]

The bottom pointer is from a later model 5.0

http://www.mustanggt.org/forums/showthread.php?t=32324

And here is a link for a discussion we had on here about the matter

http://www.7173mustangs.com/thread-timing-pointer

And a link from ebay

http://global.ebay.com/Ford-Timing-Point...67843/item