What is this part called? Where can I find a replacement?

One of the "collars" on my Dakars is missing the plastic insert that goes between it and the leaf springs. Anyone know what this part is called?

By "collar" I mean the things that "box" in the springs. I think my springs are shifting side to side, or maybe fanning out when I go over bumps at an angle. The collar that's missing the plastic insert has a nice shiny wear mark.

Cheers!

 

Never mind. The "collars" are called clips. And I think the plastic piece is an "insulator pad".