Ok for those interested in the cover research outcome.
It seems you can't just buy and fit the finned "cobra powered by ford" covers like I want. Some polished alloy versions and ford racing types will fit, and I presume other variations, but care is needed regarding the
oil filler location.
The alternates are not what I want so am going the same look as Nassty has posted and what Marty has on his car, a stippled textured finish in black powder coat.
When I change induction, I'll add the cover change to the list at that time.
Hope this helps the rest of you considering the change.
Cheers