As with many of the parts these appear to be NLA. But perhaps someone may know where to get a coup in good shape? Mine have stripped threads that attached to the body sides.
PN:
51121823112
51121823111
PN:
51121823112
51121823111
so i guess you have a '73 coupe? so have you tried to re-tap them or put an actual bolt through them into the body?