So, according to this parts list for the rear shock bushing and cupped washer stack, the top and bottom washers should be the same part number. 90948-02131.
90948-02119 is the centering washer that covers the top of the bottom bushing and goes into the bottom of the shock mount hole. With different bushings for the top of the mount and the bottom.
When I got this rig in 2016 it had two different color rear shocks and only a washer on the top bushing no lower washer or centering washer. Needless to say the shocks being vertical now from out boarding the mounts, the lower bushing split and got kicked out due to a lack of a lower cupped washer.
This is what was on the old shocks. It’s got to be aftermarket because it’s hole isn’t big enough to also be used for the lower washer.
I did find one cupped washer with a larger hole to use as the bottom. Sadly not two hence spitting out a lower bushing.
Sent from my iPhone using Tapatalk