I used F250 shock mounts front and rear. Since I removed the crossmember to mount my center tank, I moved the shock outboard of the frame. I extened the F250 mount about 4", I have some pretty long Rancho shocks mounted. Not sure if you have room with the coils and my axle is wider (14B). It bolts to a pice of 3" channel to clear the bed and removeable so I can still pull the side tanks. Not the best pic, but you can see it a little bit.