If you phone bikerite they can order you one in. Just say you want to derestrict an Agility 50 and need the 82 main jet and a smooth boss for your year model. Check what size your wheels are by looking at the tyre 1st cos you get 10" & 12" wheels, mine is 12" on my 2008, will say on tyre anyway.
I found bikerite sold me the wrong jets, twice, correct size hole but wrong diameter threads so it didnt fit my carb. I think they wanted me to panic and take it in instead of doing it myself tbh. I ended up taking out my old jet and taking it in to make sure the new one matchef in diameter.
You could try these guys if bikerite cant get it-
http://www.chinesemotorcyclepartsonline.co.uk/ Prob better to phone them cos they dont list all the Agility parts they sell. Bikerite should sell them tho since they fit them.
If you still cant get them either of those places then there is always Taipai Scooter Assassins but then it comes from Taiwan so takes around 2-3 weeks for delivery so Bikerite is prob youre best bet.