Had a request on another site for examples of factory fender bolt head markings found on 70 Metuchen built Mustangs and Boss cars. Thought they should be posted here also to help others so here they are
0T1150xx & 0T1129x In the top left pictures a past owner had a cheap and quick paint job applied so they painted over the fender bolts. That detail in that picture is incorrect and unoriginal
0T115xx & 0T1199xx
0T1193xx
0T1204xx & 0T1453xx