lashk

I noticed the engine bracket (see picture) on the rear of my '04 sportster is pretty eaten up with rust from the previous owner running it in saltwater I assume. I was wondering how hard it is to change this out. Somehow the mounts that bolt to the hull look ok but the black bracket is full of rust. I know it is important to have the engine aligned correctly, but if I reuse any existing shims and I'm careful to position it as best i can to where it was can i get away with not having to use that expensive alignment tool? Also what is the best way to support under the engine while removing the bracket? Thanks guys.