Buy the whole kit from a reputable company such as Gotpropane.com.
Cary is one of the best persons you can deal with in the off road industry. His kits and CUSTOMER SERVICE are top notch with the best components. I have his kit on my 22R and it is one of the best things i have done to my rig. If you piece a kit together you may run into issues that buying a whole kit will eliminate, for example all of the R and D has been done for you and you get everything to make it work.
Just my 2 cents, for what it is worth.