There is a ton of different crossover in power steering pulleys. Because the GM Saginaw P Series pumps are so rugged and durable, they got used in a lot of different factory applications as well as aftermarket swaps. Since GM did these pumps in two different shaft configurations it makes for a number of different types of pulleys.
So in reference to our pulleys, just because it may be labeled as SBC or SBF doesn't mean that it isn't used in other places.
