I put the Trick Step on my 2020 Caracal three years ago and love them as do some friends who bought them after trying mine. Call or email the owner, he’s great to speak with and he can let you know if he’s built them for the Puma STS. If he has, he’ll have all the into he’ll need to build them. Friend and I installed mine in like a half hour. I’m 66 too and while I liked the dancing pole on my previous Cat, I was in my 50’s then. I’m 66 almost 67 and the Trick Step is way easier to use even without all the electronics most install these days.