Jeff, thanks. I watched that video as well as one for the T264. I looked under my seat and at the back of my tractor and it is very different than the T25 and T264 in those videos. Mine is an older T254 NH series (2014 model I believe). There is a sheet metal box that supports the seat. It is enclosed on top, no hole to access the hydraulic cylinder case etc below. The hose comes out of the top of the block at the top of the cyclinder case. There is only about a finger thickness of clearance between that hose and sheet metal box.
Also there are no holes or brackets to support the quick connectors on the back.
So I'm back to my original question if anyone has done this with their older T254. TYM may have changed things in subsequent iterations of this model to accommodate rear remotes similar to the T25 / T264.
I've reached out to a dealer to see if they have a pdf of the installation manual for this kit to see how it is installed and if it would work for my tractor.
i'll see if I can get some pictures of my situation tomorrow after work.