You can get a transom from Lund for about $1000 or make a template yourself out of Coosa or marine plywood. Really depends on what shape your current transom is in. Lots and lots of guys have used Coosa with zero issues. Some guys also use Seacast, which is kinda like expanding foam. Or you can pay a shop to do it for 3-5k, lol. If I ever have to do the transom in my Pro Sport I'll definitely be DIY'ing it.