Yes, the rear window in the pictures is a rare one. Don't break it and be VERY carefull when removing the crappy tint job. Can't give you specifics on the exhaust, though it sounds like a set of twice pipes with glass packs. A pretty common aftermarket instal, many years ago.
On the 260z, I'm going to use 240Z front bumper brackets, and the 260Z frame has the 240Z mounting holes. So I welded a plate on the outside of the holes and welded the nuts in place. I just copied the 240Z stuff onto the 260Z, but had to cut some of the reinforcing out to allow the 240Z brackets to bolt up.
Are we talking discounts? coupons? links to the best sites for supplies and parts? Maybe even a "Who's in your area" thingy (What members live near you, kinda thing) What exactly do you mean by "KIT"? Physical or electronic?