I plan on putting a 3rd row seat in my '00 Yukon SLT(new body style) soon. All you need is the two piece seats, bolts, and brackets.
There is enough room in the back, but there won't be much room for any gear if the seat is down. If you want to see how it looks go to the dealership and look at a Tahoe/Yukon with the third seat.
You will be able to keep your current 2nd row seats. My buddies Denali has captain's chairs in his and it makes getting to the 3rd row easy. I'll probably have the kids get in from the back.
You can buy the factory brackets form the guy on eBay that sells them or you can buy them from
www.gmpartsdirect.com or your local dealership(more$$$). The GM part numbers and prices given to me from gmpartsdirect are:
15013755 striker x4 - $5.53 each
15038814 striker x2 (only need one I think) - $11.55 each
15038813 striker x2 - $10.42 each
11515775 bolt x14 - $2.19 each
The eBay auctions only have a quantity of one on part number 15038814 so I don't know if you need two or just one. The dealer mechanic said the bolts would be a standard bolt and that I shouldn't waste my money on $4.00 bolts (cost at the dealership). I will try to find zinc coated grade 5 or 8 bolts.
You will only have to cut holes through the carpet. The threaded holes are already under the carpet. I'm not sure of the best way to cut through the carpet. I guess I'll take most of the plastic molding off the inside cargo area and lift the carpet up a bit.
Here are examples of the seats you are looking for.
http://cgi.ebay.com/ebaymotors/ws/eB...tem=7965102985
http://cgi.ebay.com/ebaymotors/ws/eB...tem=7965739919