My guess is that these rubber bits are simply to reduce shock travel for when car is shipped, to prevent for car swinging around when on trailer or when on cargo ship's deck. Metallic bit just to keep that rubber together, to prevent it slipping off the strut, not that it is used by itself. And it's there on your car and not for most others, because someone at dealership your car was sold new at, forgot to remove it :). Probably someone working with taking deliveries of new twins and who knows procedures of shipping and/or procedures what to do on received cars, will be able to chime in if my guess is right.

Or less wordy posted here already before:

Gotta be that. Must have ridden hard with an inch + of travel removed.

We had to remove the shipping blocks 10 years ago or so, haven't seen anything like that in a while.

Clearly this is unusual

This.
They are shipping blocks used to reduce lateral movement when on the ships. We use something similar on the assembly’s we make for vehicles shipped to Europe. They should have been removed at port before they went in the truck or train. Somebody was probably hung over that day. Throw them away unless you ever intend to cram the car on a ship with a thousand others.

Doesn't belong there, just look at this schematic:
https://www.subarupartsdeal.com/part...0321aa201.html

Here’s a camaro with a similar piece

https://www.camaro6.com/forums/attac...1&d=1505137855

^^^ Better design, but clearly the florescent color doesn't help an inspector remember to remove the spacer.

Thanks everyone, will be removing these tomorrow. Going to check my rear suspension as well, just in case.

What’s cool is you are about to get a free upgrade on your car. Hahaha