Humm... I dunno. It doesnt look like a stock on, looks identical to the Thrasher Press on. I dunno... Might just get a modular system and call it a day...
did you find out what size pulley this was for sure?
98 GTP Coupe- 180* T-stat, GMPP Front Sway Bar, Dual Aeroforce Interceptor's, TDC FWI, TDC Taylor 10.4's, ZZP SS Plog, ZZP 3" SS catted DP, ZZP MPS W/3.4, AL104's gapped @.055, 3800Perf. PCM