Some of you may be in the same situation as me... when I got my blazer, they included the rear seat.... but it was laying in a field rotting away. While it had the arm rest brackets, the rear brackets and the front angle "legs" it did NOT have the little hold down brackets that held the front legs.
A blind search online led me to these little brackets, which appear to be reproductions of the front hold downs for these blazer rear seats....
I dont know how "available" they are, but here is the part number
Goodmark GMK4173517691P
I got mine from Rockauto coming now, but hopefully with that part number you can find some for your project if your missing these!
Google search got me these links
https://www.carid.com/goodmark/rear-...73517691p.html
https://www.rockauto.com/en/parts/go...racket,1000123
https://www.summitracing.com/parts/g...691p/overview/
http://www.ebay.com/itm/Goodmark-Rea...5XPp29&vxp=mtr
I havent held this bracket, but will report back when my order arrives to let you guys know if they fit my seat