Quick tip on three jaw pullers and yanking the tripod bearing. Sometimes the bearings come easy, sometimes you need a puller. If you do need the puller, you can use a worm gear clamp to hold the three legs down to makes sure they don't slip off the rear lip.
The thing about driveshafts is that they're really not one size fits all. That's basically the reason we don't stock them. If you're trying to well match your setup you'll need a different shaft based on both power and intended usage, much less geometry considerations for folks running different engine mounting kits. Personally, I think it's better to have the flexibility to choose what u-joints, material, and wall thickness make sense for your application.
FWIW, I had mine quoted at three of the big DS manufacturer (DSS, Denny's, blanking on the third). DSS was the clear winner. I'm not affiliated with them, but that was my experience for my own competitive bid a few years back.
