The width of the SIP shock is not quite wide enough meaning the nut just runs out of thread when you tighten it. This destroys the threads on the bolt and/or nut. OEM is just wide enough that there is enough thread.
"Maybe there is a missing spacer for the SIP". No, you can watch their installation video on youtube if you wish - no spacer.
Solution: use an extra or thicker washer. (standard washer included in both photos)
With the SIP I did destroy the thread on the bolt (not pictured) and had to replace it (shown in photo). The bolt is not available as a separate part therefore the whole bracket needs replacing. My new YSS are fine.
OEM with standard washer
SIP with standard washer
