So....another Nova Rossi RS12 T5? Yeah, friend of mine did the same thing (actually, the whole P/S melt into something....)
You have to understand, you are not just going to replace the P/S only....the shaft within the pisteon, and the conrod......then you have to make sure your SG crank is still working........but the most important parts - those bearing.........you might have to replace them.
If you buy them parts seperately, I garantee you it will cost MORE then a new engine price....
I would sell the leftover on ebay for like $50-80 (someone might want the heat sink or the crank case or the bearing or the carb or the TURBO button or the SG crank.....etc) then use the money to buy yourself a new engine (for another $100 plus).....you have to understand, your new P/S from Nova Rossi can cost you around $100 US and you still need the conrod and stuff.......so you have to spend that $100 anyhow, might as well get a NEW ENGINE to start with.