We've got rusted out exhaust flanges (at the y-pipe) on my son's 03 Liberty, but the rest of the pipe looks good, it still has the oem catalytic converter. Thinking of just replacing the flanges, anyone know if the y pipe is available, or maybe know the pipe size (or Walker, etc. part number) for replacement flanges? I hate to spend $400+ on an aftermarket converter, just to get new flanges. Thanks!