where to find 8.75 sure grip units used

Dam So-Cal yards BARLEY have any classic mopar metal be it truck, van, or car! I quit going to the yard after they said "okay 5-pin ecu..."untested, looks terrible, caked with grease...that'll be $25!" LOL Mopar2 just put in a sure-grip unit instead of replacing the whole pumpkin? i'm not sure how that works.....

There was an old Dodge pickup "camper special" complete at pick-your-part on Beach in Stanton a few weeks ago. I looked under it and it had an 8 3/4 but the wheels spun opposite. Should have taken a closer look.