1969 Dart---Spring relocation with mini-tubs

Thanks to all...looking forward to participating as a contributor where I can and an avid knowledge seeker always.

NOW...if I might ask a trickier question...is there an aftermarket replacement fuel tank that is about 25"-26" wide (rather than the original 29.5" wide tank) that will allow clearance for exhaust pipes to hug the frame and exit at the rear bumper?