Got a pair of these 'short' spoilers in the pile of parts when i bought my car. They are fibre glass.....is this significant, as in are these 'real mopar' parts , say from a AAR car? Perhaps I should e-bay them if so vs put on my 340 car. Regardless how do you properly locate these since there is no holes for them on my fenders......there's 2 holes in the spoiler.......thx