Well, I know you MkII guys sort of live in a fantasy world where you can pretend that MkIs and Spyders are not MR2s

, but I do a lot of business with those cars as well. I try not to assume that everybody's car is a '91 turbo T-top

.
The relay comes with the antenna assembly...it's a little unclear what you actually have, so I've attached a pic to try to clear it up. You can buy either the mast and cable (PNC 86337) or the complete assembly w/ motor and relay (86330), which of course includes the mast and cable as well.
86337-17110 - $42.33 - Mast and cable assy
86300-17110 - $229.15 - Antenna assy w/ motor and relay
69277-17020-22 - $10.66 - Door handle bezel, RH
Shipping would be between $5 and $11, depending on whether you went with the lightweight parts only or the whole antenna assembly.
Just give me a call if you want to order anything. Thanks man!