So, here is the diagram for the 2016~UXV450i Kymco Side x Side CVT
Its possible that AC requested Kymco to build the engine and powertrain to a different spec, not sure.
They don't sell as a "Kit", just individual pieces. I can get the parts but it would be your risk if they were correct or not
Also, here's the # for an AC dealer I do business with,R&M Enterprises - 925-798-4360. Talk to Rick. AC chose to not renew many of there dealer agreements, at least here in CA, so Rick may not be able to order parts any longer (Tell him Chris from Sweco sent you). AC / Tracker, is putting all there marbles in with Bass Pro Stores so one of those stores may be able to help (Good luck with that, they will likely try to sell you a boat!).