You need a 10PA17C 6 Groove Pulley.
www.jensonauto.com also on ebay has one left at $235.00 and $20.00 shipping for a New NIPPONDENSO with a remanufactured clutch and pulley. I've been looking for awhile and that's the best deal I could find one for, and all I needed was the clutch. (The 1990 base model came with a 10PA20C) it should come with the right connector, if not splice in your old one for the coil.