Guys..I have a set of ribbed nailhead valve covers on my Wildcat 2x4 engine...my friend needed just one valve cover, so I recently bought one from a v8b member (ThanX Fred!) ....while they BOTH appear to be the same, the new one sports a different part number? ie: the driver side of MY set is 1370315 and the driver side I just bought is 1366223. I believe one is perhaps for an a/c bracket equiped car??? o No: Or a single carb engine? OR different year/application???ou: ..whats the deal here? uzzled: ThanX! Wheelz, Tampa Bay