The plastic brackets/fins

[Flow Master]

On the oem running boards on a LC200. How does the plastic brace at the backend of the running board cap gets mounted?

 

[mpmoody15]

On the oem running boards on a LC200. How does the plastic brace at the backend of the running board cap gets mounted?

View attachment 3388830

I can’t give you part numbers but here is a pic of mine:

 

[Flow Master]

Am I to assume that they serve no function structurally?