Extreme Max3005.3855 Straight Transom Saver with Roller Mount - 29" to 53"

Will this wirk on a trailer without rollers?

Do they make a saver for trailers without a roller ? my trailer doesn’t have any rollers.

I have a triton with a 115 johnson what size do i need

What is the gap on the U-shaped bracket which goes over the trailer's rear roller? It looks too small for my roller.