Our Part #901 Aftermarket Rear Sway Bar Installation Kit uses larger than stock diameter u-bolts to fit the larger diameter axle tubes on aftermarket rear ends (either 3.00" or 3.25"). The stock sway bar bushing shells are made to fit the factory size u-bolt. The factory bushing shells do not have enough material to modify (lengthen the slots) and you will need to use aftermarket polyurethane sway bar bushings.
Aftermarket polyurethane sway bar bushings come with a larger shell that has longer slots. Depending on the brand and style you may still have to lengthen the slots a little with a die grinder but there is plenty of material there to do so.
If you order the polyurethane sway bar bushings from us with your Part #901 Aftermarket Rear Sway Bar Installation Kit we pre-slot the bushing shells so they are ready to mount when you get them.