valve covers

There are 4 versions Im aware of first was and carried through mid 68 were smooth, next were mercurys 58 through 60 had an embossed large m at the left side with a horizontal tail to the "m" that extended to the other side I saw one with a decall denoting h.p. next was the edsel 410 these had a large E and the numbers 475 denoting the output torque of the engine "I guess this was more impressive than 410. same as buick did with their engines. last and very rare were the super marauder these were finned with a big m in the center. I dont know if these were available to the public but Ive got a factory photocopy of the supermaurader package with these on it.The 61 through68 lincoln used the standard smooth type as did the 59-60 430 tbird