Bench seat swap info needed

[nxtruck]

I'm wondering if anyone has any dimension info on various bench seats, maybe from swap projects. I'm planning on removing the race bucket seats from my truck and installing a bench seat. The problem I'm having is that, because of the rollcage in my truck, I can only fit a seat that is no wider than 55". The factory bench seat is 60" wide and won't fit without trying to narrow it somehow. I would rather find a seat that is already approx. 55" wide and use that. I've already contacted the two salvage yards close by and neither of them were of much help.
So, if anyone has any helpful info, it would be much appreciated!! Thanks in advance!!