someotherguy
Even more awesome in person
Easiest would be a seat from a crew cab, or a regular cab. The seat styling you have in your '99 began in '95. Many '95-up bench seats are a split style, and the split bench from an extended cab is a little harder to swap into any other cab style due to bracketry differences as an extended cab has a unique floor shape. You can do it, it's just more hassle.I have a '99 Suburban. I want to put a bench seat up front. What trucks can I source them from? Post facelift Suburbans I imagine are fair game. What about pickups? Single, extended, crew...are they all compatible?
Finding one in good shape can be tricky. Look at crew cab REAR seats as you may find one that doesn't have a bunch of wear. Don't forget to get the seatbelts.
Richard