Shop › Shock Boss, Unthreaded 12mm, 1 3/4" Long Image 1 of 1 Shock Boss, Unthreaded 12mm, 1 3/4" Long $4.95 For fabricating shock mounts. Comes in 1/2" or 12mm x 1.5 bolt sizes. Threaded or unthreaded. Add To Cart Added! For fabricating shock mounts. Comes in 1/2" or 12mm x 1.5 bolt sizes. Threaded or unthreaded. C-217-2713-0 You Might Also Like Heavy Duty Aluminum Alloy Side Cover for IRS, Each $89.95 Trans Mt. Adap. Kit, 73-79 Chassis with 2-Bolt Nose Cone (61-72 Trans) $105.95 Low Back Poly Comfort Seat $118.95 Forst / IAP Weld On Adjuster for Front Beam (2 Variants) $29.95 High Back Poly Comfort Seat $129.95