Exhaust Gasket

Hi all, Sorry I do not have time to search as my car is in the shop and they are calling me telling me they can't get a part for my car. I had the passenger side gasket between the exhaust header and pro chamber crack and create a leak. I took the car in today to have the gasket replaced. I told them the factory ford gasket would be fine. They called and said they cannot use the factory piece because that is a flange, and the piece that cracked was a gasket. I cannot remember as it was over three years ago that I installed the pro chamber. If I remember correctly the driver side and passenger side were different. Perhaps they got that screwed up? or do I need to order a gasket from MAC? Thanks

-Mat
 
Ok, the guy at the shop is telling me he is not able to put a factory gasket between the header and pro chamber. He says the factory gasket is completely different than the gasket that came with the pro chamber kit. This does not make much sense to me because the pro chamber should theoretically mate to the header in exactly the same way as the factory mid-pipe. Does his statement hold any merit, or am I completlely missing something here? According to the previous replys, it appears the factory gasket should work, nobody has said anything otherwise. Thanks

-Mat