Found a new bump stop option.

[Jason@SportsCar]

Originally Posted by ern-diz

Do you also suspect that's what's happening? I'm about to install B8's and based on this thread, am trying to decide if I should run the shorter stops or get new OEM size.

My Tein springs instructed to cut the OEM stops to a specific length. If the B8's are designed to replace OEM from a ride height perspective, then they should require shorter stops in a lowered application...

That replacement shock clearly (looking at your pic) is bottoming and destroying itself. Most of the Bilsteins I have used included a bump stop, which was slightly softer than a hockey puck. I would say this is a case of a replacement shock that "fits" but was not engineered specifically for that application.

Even if Bilstein went to trouble of building a Yaris specific strut it would not have been built around your Tein springs - and you can assume by the Tein instructions they expect you to be using OE struts.

I would use the OE stop or put a spacer in that lets the aftermarket bump stop do its job. You could still trim it a little, but it needs to protect the strut.