i had heard that a company once reproduced the ram air plennum for the 71-3 mustang. ford made them stop because they put the ford part# on the plennum. the company still continued to reproduce the plennum but with an altered part#, one that was much larger in dimension to make their part different from an original. but other than that they were identical. any truth to this? are the numbers on an original plennum close to a half inch tall? thanks in advance.