Locker preference?

Can anyone recommend a mechanical rear locker on an 01' X with 4x4?
Powertrax still has none for Nissan I think Detroit would be good. Got a Detroit part number?

Thanks

ARB is the ONLY option for the Xterra.* The Detroit and LockRight only fit the older 31-spline diffs, ours are 33-spline.

*You can get the carrier and axle shafts from a 99 Frontier with an open diff and swap them in (they're 31-spline) but unless you get the parts real cheap it won't really come out cheaper than an ARB.