42.164 mm is the length of the sleeve. This dimension is the only reason I bought. My 17 f350 front end was making articulation noise a few months after the shop put the shocks on used 30mm bushings for some idiotic reason. These bushings also destroyed factory bolts. Although honestly I expected there to be 2 bushings and 2 bushings in the order since there are 2 shocks in the kit but I didn't read. It also doesn't hurt to replace the M14 bolts with a 2.00 pitch. Unfortunately I don't know the length.