IA NOS tailgate trunnion/bushing LH/RH 73-79?

[gmachinz]

I am not positive which years these are 100% correct for but I know my 1984 box does not use this style-I pulled some of my NOS hardware out of storage for my truck and mine take the square type of trunnion-not round. These are NOT available anywhere on the GM locator and before anybody asks I don't know why the LH is anodized while the RH is plain/bare lol. But these are LH and RH part numbers:

15596975 LH
15596976 RH

I have only this pair-asking $100 shipped for them. These pieces always wear out and I don't even know if aftermarket versions exist but since these are GM and little hardware items like this are tuff to source I don't mind them sitting on the shelf next to my NOS 73-80 tailgate but if somebody can use them, $100 takes them!