As Steve has pointed out already 1998 was the first year for the ''Quad Cab" BUT it was a option ONLY. You had to order it to get it for that year but 1999 and after it was standard equipment. 12 valve quads are rare,but not hard to find,especially now with alot of people going to the new ugly trucks. Our local auto rag has had alot of 12 valvers for sale the last 3-4 weeks in them and many Quads,however I have seen no sticks... ... . Andy