I recently bought a used S front spoiler, but it doesn't have the "L-shaped" side brackets I've seen on most pictures online to attach to the car on each side. It does have pre-drilled holes for mounting a bracket though. Name:  front_bumper_side.jpg
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I thought 901.505.135.01 might be the right part, but it looks like that part is actually supposed to attach to the top of the (missing) bracket.

It seems straightforward enough to make a simple bracket, but if there's an off-the-shelf part with the right dimensions, I'd rather go that direction. Thanks for your help!