Undertray attachment parts

[patriot66]

2 and 3 connect to side plastic parts that mask up the sides of the bumper (bridge the gap between underside bumper and wheelarch).
So they screw in to the inner/under sides of part 6:



What I don't understand is why only that flat tray has a rubber lip/air dam.
Thats imho an important piece to seal up the space behind the grilles so that the air is forced through the radiator and ac condensor (those parts seal pretty good against all sides so air can't escape along that way)

And none of those undertrays is for an M bumper? (that as an additional oil cooler on the underside so I could imagine thats a bit differenty shaped regarding that air dam)

This one IS for an M bumper

Mind boggling isn't it ?

 

[GuidoK]

Makes sense, that rectangle part in front is maybe to seal the oil cooler on the underside (so that air doesnt escape there and is forced through the cooler)

 

[JINGLE]

Yea my photo shows the standard (on the left) the //M (at the top) and the modified //M (bottom) to fit my APR carbon splitter all together in 1 piece

 

[ValleyZed]

Apologies for the thread revival.
My new undertray arrived today but doesn't have the 'lip' at the front of the undertray like those in the diagram.

Can anyone confirm whether this will fit my E86 before I attempt it please?