Seat mount length question

I picked up some adjustable seat mounts for my Briggs kart, the ones that were on the kart when I got it are intended for a cadet and are way too short. Because the ones I got are cut to length ( I was wondering if I could get someone to measure the length of the rear seat mount brackets from the frame to the end of the mount. I’m sure they vary between manufacturers, just trying to get an idea of the range I should be in. TIA!