I am assuming this is on a jeep, but I'm sure it's the same for all rigs. The jeeps have very week control arm mounts that always seem to find the rocks. They will need to be replaced at one point. The stock adjustment for these fixed arms use a cam style bolt with an elongated hole in the mount. With an adjustable link you will be able to use a stronger mount and get rid of the cam bolt. If you stay with the fixed link you will have to keep a way of adjusting the axle to keep the ride nice, as stated above. Make your links only adjustable on one end to make it work and keep the price down, or go both ends with left and right hand threads to make them super easy to adjust.