Looks like a good winter project.
Housing around lower control arm ?
Yeah, the apron that covers the coil spring in the engine bay...mine has a big 'ole rust hole right above the steering gear. We're probably going to have to mig weld a patch on it, I haven't seen any replacement parts.
Is this it from OMS
Inventory currently out of stock, please check back soon or call for more information. Item #M425R
71-73 OUTER SHOCK TOWER COVER, RH
Right hand outer shock tower bracket. 16 gauge die-stamped with 14 gauge inner support welded in place.
You'll have to get some from a salvage yard or talk with Don. They have the 'shock towers' for just about every other model year before ours.
Mine are shot out on both sides of the structural portion, as well as my cross-member is toast, along with the left front subframe itself. I was lucky enough to find a car in a local yard that will replace pretty much everything from the torque boxes forward... providing the yard guys didn't just cut it off at the firewall, that is.
I honestly think that your problem is not structural in nature, and you should be able to fabricate a patch to repair the bad section - the center portion that mates up to the cross-member is the critical part to structural integrity. An English Wheel would make short work of the contours, but I'm pretty sure a suitable patch could be done with simple hand-tools if you're not too picky about contour perfection.
Good luck with it!