I want to put some lowering blocks in my 55 super 88 , I was just wondering if anyone knew off the top of their head what size ( as in 1/2" 5/8" ) the Ubolts are and also what the locating pin/hole is on the diff - is it standard GM 1/2"?

I know I can drop one side of the car and check, but wont be able to get to do that until next weekend, and I would like to order them this week if I could.



thanks.