I have a '49 thru '54 truck bellhousing on the back of my 261, to which I've mounted a T-5 transmission. I've been searching for some time for the cover that goes on the bottom and covers the clutch assy. All of the ones I've found have the right holes on the front, but the back ones don't line up. The front holes measure 15 3/4 and the back ones are 9 3/4, on center. Can anybody help me?