Check that link under 2.3.4 in 2.2 class. Since you have the 2.2 rig, you might wanna reconsider spending on rear steering and find out that its useless.. There are a lot of best performing digs out there. I personally use the S3R dig which gave me no problem and has all steel internals. You can get HR dig too at a lower price. All you need is a High torque servo and a 3 ch 3pos radio like DX3R or a modified TQ3.