I have 2 Malossi final drive kits, different numbers, one supposed to fit People 50 2T (it didn't), and the other for Super 9 LC (I don't know it it fits, haven't tried it yet).
I did a lot or research on final drive, and info very skimpy, not reliable. I do know without final drive, 70cc kit doesn't really increase top speed, but you get there faster, and can stay there into head winds/ going up hills. 70cc kit is nice, but you really need final drive kit to make it work the best IMO.
Look around, there are final drive kits still out there, they come up on ebay from time to time. I don't want to sell mine because I might still use one of them. I still have 03 Orange Super 9 LC in very good condition, low miles that I like a lot, but haven't done much to make it go fast yet. Cheers