I finally got something accomplished. Work and Wifey took a dent out of my playtime but I pushed and got them in. It seemed like it would be harder putting the late model stuff in my 75, but with some simple measurements and planning it was as close to a bolt in as it could get. Just got done with the driver's side yesterday. Really all I had to do is fab up some brackets to bolt the new seast tracks to that I drilled to match the seat bolt pattern on the floor. I took about 2 hours for the pass side and 4 hours on the driver's side (broke a bit and had to refab and redrill the rear bracket). Bolt the seat to the bracket and bolt the seat to the floor and its in. Intregal 3 point belt and all! Biggest deviation was ditching the stock 75 vintage seat brackets. It was easy on mine since they were welded to some Toyota buckets. The main reason was the silverado tracks in addtion to the blazer mounts would have the seat siting 6 inches higher than stock. Not Good! I did loose the flip forward motion on the pass side seat. But with the pass side up forward as far as it goes and the seat back forward the pass though is about the same to the back seat. The only other issue is the seats will not go back as far as the tracks have travel for because the '75 does not have the footwell area for the back seat that a later one does. No big deal because the seat still goes far enough back for me and I'm 6'1". Comfort is way better over the toyota seats I yanked out and the feeling is much more secure over the lap belt with a modern seat belt setup. Now once I can locate my digital camera I'll get some pics of the install. Not to difficult and highly recommended!