http://www.ultimateparts.net/aprilia...a19d116c2c3ab2
Dont mind the price you can probably find one cheaper just trying to show you they have top/cases or a trunk what ever you wanna call it.
Damn 4.5k is really steep
you should think about buying a really good 50cc that fits to your liking and then do an engine swap and youll have a lot more extra dough to spend on upgrades etc.
Where im from you can find a Roketa 180cc for 1.7k fits great for me (6'3 180ibs)