I don't have an undertray so I don't know. I just know the fins are supposed to be pointing straight back so that the undertray can fit. OP's fins point upward against the undertray but lucky for me, I only have 1 fin that points upward. The rest are straight.

If the fins DO get in the way, you can always cut them off. It doesn't serve much of any purpose anyways.

 

http://cgi.ebay.com/ebaymotors/ws/eB...m=360332237491

Somebody jump on it! There's one left I believe!!

 

Why didn't i see that one when i looked yesterday!

 

Chinese craftsmanship