There is one good quality kit that you can use with really good results. The HeartlandUSA 2-5-0 wide tire kit.
www.heartlandbiker.com If your interested in this kit, I can point you to a gentleman in NJ who has the best prices on these kits.
The kit comes with a new swingarm, curved billet struts(Chrome or black),axle,primary offset spacer and all needed hardware. Its the best kit on the market I have delt with. True bolt on and no odd installation issues. Turn-in both left to right is near factory. Be aware due to the larger rear tire, turn in will take a bit more effort than if your using a stock 150 tire naturally. The bike is surprisingly well balanced with this kit, an RSD tranny is not needed at all. And don't waste your time on those open style belt primaries. They may look cool, but they don't add anything at all in terms of performance, and many hurt your turn in lean angle to the left side and depending on weight may adversely affect your handling. The shifting action also deteriorates when the dry clutch pack heats up. They may be good for short drag races, but they are poor setups for street bikes.