Who knows the difference in pulleys for 89, 90, an 91

I have a stock pulley in my garage for either an '89, 90, or 91 Supercharger. Does anyone know how to determine the year. I know that there is a number on it. Who can tell me what the difference is "if any".
 
89 - 93 SC pulleys should be the same. 94 - 95 were a bit larger. A 1990 pulley works nicely on my 95, and the price was right :)


cheers
Ed N.
 
I already have a 1990 pulley swapped on to mine that I was able to pick up locally here in Toronto for a good price, but thanks anyway.


cheers
Ed N.
 
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