Millions of them in the boneyards. They are used on every SFI 3.8/3800 Buick motor in the late 80's. That eBay auction is incorrect. They never used the covers on Fieros. And they fit any EGR valve.
Thanks for the replies, I'm going to try to get to the local boneyard tomorrow morning and if I can't find one then I'll still have time to bid on the one that Jan found for me.