What size belts for ASP pulley???
ps.
Its for my brother so its going on a 98 ss that is all stock!!
AC Belt.................11-378K4
accessory belt......11-760K6
do you know about seating the pulley with the old bolt and then putting the new bolt in?
If you cant get enough thread to pull it on, put the pulley in the oven at 200* for 10 minutes, then take it out and quickly put it on the car. This usually does the trick.
If it still doesnt work, go buy another bolt from a bolt store....M16 x 2.0 x 120mm in size...this will get you the length you need to pull it on. Then you can install your new GM bolt and torque to specs.

