For a 2009 RX-8 R3, for side-spoiler F197519H1A, there are five bolts BR70500Z2 (6mm?) that attach it to the support above through what appear to be metal 'speed nuts.' I do not see these speed nuts for these 6mm bolts on the parts fiche. I do see speed nuts B45556135, but I think these are plastic and are for the small diameter screws that hold the front of the undertray to the support, and are used elsewhere.

Can anyone come up with the part number for the speed nuts that are used for the side-spoiler large and BR70500Z2 bolts?

 

Actually it’s four screws; Item 50-015C, and a permanent rivet (not the plastic removable type); Item 51-833.

My assessment is that the part you’re looking for appears as Item 52-841A on the parts diagram. It will be located on the part that the spoiler attaches to.

 

I thought it might be 52-841A, but this appears to be a plastic clip (if you do a Google search) and seems to be the clip that the small screws for the undertray go through (four in front.) It has a hole on one side that is 6mm and on the other side is about 3mm (to receive a self-tapping screw.)

Screw 50-015C actually is about 6mm and if I have it right, the speed nut is metal.