Sounds good, several of the O'Reilly guys have helped me out a bunch. Been a learning curve for both. They actually have a book they can look up by part attributes.
On the 87 El Camino we actually found the pulley we needed as a Toyota part. Just needed shaft diameter, had to make a key for it but local ACE Hdwr had the key stock needed.
You are right on the radius. Some mechanics forget that some times you make a change you have to multiply by 2 or divide 2, whichever the case may be.
