Your variator is the same as all the other Kymco 50cc bikes so use whatever.It's actually the drive boss that is different but a new variator, and rollers for around 50 bucks is a much better way to go. There is also a spring that controls the rear pulley set. That should be upgraded to a Malossi red spring. It will help w/ hills, and take off.
Looking at digging into my transmission...I need hill climbing ability more than overall top speed. For my weight, around 200, I've been reading a Malossi red spring and Dr. Pulley 7-8g sliders, will this help on the hills or should I adjust some for that? Also, should I look at replacing the variator too or is the stock one sufficient for more uphill driveability and less focus on top speed? Thanks!