Carmate seats are about 1/8 scale used to be popular because they were the only ones available for many years. They are a good fit for tubers like my Sniper and Wreckluse, and your Timberwolf. These tubers were built from scratch with these seats in mind.
Maybe slightly big for a Tamiya Hilux Truggy interior, but they sure can be retro-fitted, nicely.
Can also get the Mastercraft replica seats by Reign which is very popular in the 1:1. Or maybe racing seats with the very scale 5-point seat belt by team3six.
There was a guy based in Malaysia that used to sell nice reproductions of the carmates for $5 at Scale4x4, with the back already covered
Oh yeah, the Carmate Seats are hard to find. Get em while you can especially if you prefer the Recaro Design. They go for about $30 for a pair with custom buckles/seat belts by Scale Designs.