They don't work well up front.
I tried the non-greasable versions from Energy Suspension back in 1999 when my stock bushings looked like this (only 3 months after I bought the X).
I tried these...
They are a bad fit because the mount on the frame is staggered so you need to shim it.
Since the Energy Suspension bracket is just flat steel that is bent, it offers very little strength. The Nissan bracket is ribbed and much stronger.
They lasted one week before the bracket was bent and weak and pulling away from the frame.
I went back to the Nissan bracket and bushings, which were rather cheap and easy to replace.