I would go to Trick/Olimpic and ask for help identifying what year and model and go from there. They may still have nerfs and will have the tank and motor mount.
A 15* mtr mount international spacing . Most any steering mount fuel tank .
Nerf JPM motorsports has custom made reasonable . Trick or any good kart shop on the home page .
Turk bros , Waller , JC Specialty and Palmetto.