Speedo Reducer...
I'm no COPO expert, but the E-70 x 15 would have been the tires with the RS package..?? or some other upgraded suspension option. Std. wheels were 14" XT...or the COPO wheel as the say on Flea-Bay 
Gurus can add to this I'm sure...
-wilma
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02 Berger 380hp #95
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