I found some sliding rails at the auto-wrecker. But by the time I removed the mechanism and modified and looked at the latching bar, I realized that my seat would end-up being too high. So, I bought a basic seat slider kit from NRG. https://getnrg.com/products/sbr-001

Took a while to figure out the bolt placement to avoid the 4" chassis tube. I placed a flat steel bar along the back to manage that. I also placed a 3/4" steel tube under the front to angle the seat up a bit for extra leg support. Had to make sure the seat could be installed and removed by just sliding the seat front and back, too. I'm happy with the end result.