Side of seat

I bought a kart 2 years back that had a piece of plastic on the side of the seat to support the upside of the body. Worked awesome on high bite tracks. I went to pa last year and seen a few guys with the same thing. Does anyone know who makes them? I made a custom piece on my seat for an indoor race I ran, but had. A few people ask where to buy them. They were all on select seats. They are good for us taller guys when seat is laying down.
 
A lot of guys attach a kirky head rest to the side of the seat and claim that helps tremendously, I can't put myself to do it though lol
 
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