Wilbers shock, it's the one with spring preload and rebound damping adjust.
I ordered it -50mm so is ok to be used also on XT660ZA abs model.
I have done only 480kms with this.
My xt660z lowered more than i wanted, became like xt660za.
Comes in the original box WITH the 5 years guarantee and all the papers & info from Wilbers.
More details from manufacture here bellow:
https://www.wilbers-shop.de/en/Motor...9gbo6u06ohim06