[mongocanfly]

You'll need one for every joint...I assume you mean the couplings...it all depends on how many pieces of tube you use and how you route it..you'll need a T for the rear axle and a T for the front ..unless you run 2 fronts from the prop valve...I got all mine at oreillys
Mine is all 3/16 for the fronts and 1/4 to the rear , and then splits into 3/16 at the axle
You'll need to determine what thread size you have..
Are you gonna try to do it all in one piece or use the premade sticks like the parts store sells?