I have a set of the ones you saw on eBay. Haven't installed them yet as the engine isn't finished. They look really nice, well made and clear roller rockers because of the pent roof design. P.A.W. sells them also or did as of my last catalog. They are kind of rare though.
You can use adapters and real FE covers. It does make for more chance of
oil leaks because you have two gasket surfaces per side instead of one, but others have done it w/o leaks.
There are also these:
http://performanceunlimited.com/cobr...lvecovers.html
Beautiful but please make sure your sitting down BEFORE looking at the price!
Larry