"Could I just take seats out of an extended cab or Explorer and drill new holes into my cab to match up?"
Do not see why not. Front side bolted in just fine, rears hung out a bit.
If we did not have plans for the floor space, we figured on drilling new holes and bolting them in with some large lock nuts and washers on the underside.
White 2001 Ford Ranger Edge - step side- ext cab - 3.0 V-6 2-WD 88k
I have determined that most mechanical / electrical challanges are directly connected to the nut that connects the steering wheel to the drivers seat.