I wanted to do the same for years and even though I have the ability and needed Buddy network to do any fabrication it just became ridiculous, buckets or bench. Comes down to a safety issue for me. I'd recommend taking all or half your seat out and start measuring and photographing what your up against and then make a mock-up. Don't forget the seat belts still need to work too. I decided it wa easier to use a single plate with the new track bolted to it and then that plate bolted in the truck. No welding and stronger than modifying one or more leg of a track. Once everything bolted up including the seat and belts I had a machine shop water-jet the excess center material out and smooth out all the edges. Very strong as one unit and all bolted together with grade 8 hardware. That was adapting T100 buckets to it. Did one side, didn't like the seat so I'm back to my 60/40 and will have my local upholstery shop build it up to my needs instead of wandering junk yards wondering "what if" . Good Luck and keep us in the loop.