The Stealth Conversion's U-bolts for the Colorado are made specifically for the Colorado. The Colorado uses an axle tube that is 3-3/16" diameter (compared to 2-3/4" on an S-10 Truck, or 3" for most full-size trucks).
The Stealth Conversion's U-bolts are made from 9/16" diameter steel, instead of the 1/2" diameter normally used by other manufacturers. The 9/16" diameter U-bolts cost a lot more than the 1/2" diameter U-bolts, but they are worth it because they are much stronger, and they can be reused, unlike the 1/2" diameter U-bolts which often fail when installed more than once.
The "Hi-nuts" used on the Stealth Conversion's U-bolts are much longer than normal nuts, and they resist stripping far better than normal nuts.
You can purchase our Stealth Conversions heavy duty U-Bolts in sets of 4 including the Hi-nuts and heavy duty washers.
Torque these u-bolts to 85 lb-ft.