I have a new set of Python slip on mufflers that I bought for my 09 Heritage Softail. MFG part number is 1801-0378. The specks show that they are made to mount on 1 3/4 inch header pipe which is what I have. However the muffler flange is 1 7/8 inch and that is just too much gap to tighten up. The muffler clamps won't even fit on them. Has anyone else had a problem like this? Thanks