As the title states...these are the mounts for the front steel bumper which mounts behind the nose.
GM used the same brackets for '77-'81.
Stamped with GM Part # 525757 and 525758
Good condition (not bent)...install as is or media blast and paint for a restoration.
$40. plus actual shipping costs via USPS from 47630
Reference pix:
'77/'78
'79-'81
Actual pic of parts: