rcd suspension lift

ok i have a 01 xj i just bought a new 5.5" Rough Country lift to put on this weekend if the weather is good ? is i have a lift now a RCD lift 3inch and a kid i know has a 91xj and i am wondering if it would fit his jeep i checked a few sites and couldnt come up w/ any answers so anything is a help

Yes, should only need new U-bolts.

thanks a ton