is anyone using the adjustable front coil spring spacers from rusty's or 1source manufacturing on their xj? mine is a 99 4door se 4.0L AW4. at $200 i'de like to know if these are going to hold up in the long run. i dont want to turn this into another boring/stupid lift kit thread. just lookin for some info on these products. also anyone know of a source for an adjustable rear xj shackle?