OK, it's the small rod or pin on the brace that the spare is bolted to, which slides up and down the fixed brace. If so, I can measure mine but not 100% certain that all spare tire braces were made the same. I think mine is a repro so all bets are off.

Thus I agree with DADS50 to just measure the ID and width of the fixed brace to see what is the largest diameter pin that could be used.

Craig

My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear
My truck ....... Respect The Rust
If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.