Third row seat options for 97 Yukon

I have a 97 Yukon that I am interested in installing a third row seat in. It was not originally equipped with one. I've seen some posts here about how it might be possible to add the OEM seat to newer models buy getting a few parts from GM. It is the same for a 97 Yukon/Tahoe?

Also, where are the seat belts mounted for the third row? Are they mounted to the seats or to the body like the rest of the belts?

Lastly, does anyone have any experience with this outfit:

http://www.littleseats.com/

They make a third row seat that fits my year Yukon.