There were two different distributors put in the cars, a Tec and a Hitachi. The Tec distributor has an external coil, and you can identify it since the cap has a 5th wire going into it, the coil power. The Hitachi seems to have an internal coil, and only 4 wires on the cap. You can identify whats on your car by looking at that. What kind of price are they getting on ebay?

Tec:



Hitachi:


There also should be a tag or stamping somewhere on the distributor, see if the seller can find it...or at least give you pics of it.