? you still really need to be more specific in what you are asking. In regards to the one question that you did ask clearly, basically there are 4 common sizes for supercharger pulleys, there are the early model 89-93, the 94-95, the 5% and the 10% in terms of providing the most boost (pulley turning the fastest thus being the smallest) the order is the following from largest to smallest:
'94-'95
'89-'93
5%
10%
I believe the difference between the '94-'95 and the '89-'93 is about 3%, not certain whether the 5% pulley is off of the '89-'93 or not, but I believe from what I've read on the board that it is... in which case:
'94-'95 = -3% (largest)
'89-'93 = 0%
5%
10% (smallest)
The '89-'93 is a good improvement for the late model blower if you can find one cheaply, otherwise just got with a 5% and yes, they are all interchangeable in terms of fitting on the supercharger.
Paul