Originally Posted by The Dro
The ones AllMakes sell are Mammouth and the Wingtop Vents sit ON the checker plate
The part number is WTKIT01-NG/B.
Not necessarily. We stock, sell, and install lots of the Mammouth wing-top plates and on all of them I've installed the vent covers go UNDER the chequerplate. The exception to this is Lav's SDO milled vent covers which are too thick to go under the plate.
I can't see any reason why someone would want to mount the vent covers on top of the plate...
And no - don't put foam between them. They are going on permanently (drilling holes into the wings after all) so either spray on a rubberized coating to the back of the chequerplate, or if the wings are in rough shape use a marine sealer to fill any voids (tape the wing around the chequerplate to make cleanup easier - let the sealer squeeze out and wipe off excess. Once cured remove tape.)
As to the texture - I use a matte non-skid coating to reduce glare and add texture.