I had the same issue some time back. Here is how Henry dealt with it.
http://forums.pelicanparts.com/showthread.php?t=345456
I ended up bending a piece of sheetmetal into a cone shape and cutting the left rear tin and welding the cone shaped piece in. I also had to notch the MFI belt cover to clear the newly formed tin. I too discoverd this after powdercoating. Don't have pics of mine finished but might be able to post some tomorrow evening.