You'll probably have to drill 1 or 2 holes. I've done this swap a few times and the holes depend on year model.
Do beware you'll need a seat from another extended cab truck; the center brackets are different because the floor shape is unique to an extended cab.
I seat-swapped my '94 C2500LD extended cab to a 60/40 bench because the buckets it came with were ragged, bad. I had to drill 2 holes; the rest were there. You may note if you pull up the carpet on the passenger side often there are 2 forward bolt holes for the passenger side track; 1 will be plugged with a large torx bolt and you simply move it over to use the correct hole.
Be sure to get the seatbelt buckles too.
Richard
Post was last edited on Dec 27, 2011 01:21. Edited 1
time.