Flowmaster 40 Series Question

[72step]

I am planning on replacing my current cheap crappy turbo mufflers with some 40 series flows. I know this is a dumb question, but my current mufflers are between the trailing arm and drive shaft with only a few inches to spare between there, and I'm just wondering if anyone else has flowmasters there and if there's any problem with clearance issues or if the flows are wider. The reason I want to ask before I order, is because the muffler shop I called suggested maybe I might need round mufflers because of the trailing arms when I told him it was a 72. I just want to make sure they will fit in there. Thanks in advance.