Hey guys, I'm looking for a site that has OEM style hardware, screws, plastic fasteners, etc.

I'm specifically looking for the screw grommet that fits in the holes for the OEM speaker location. I designed and 3D printed a 6.5" speaker adapter that mounts to the 4" speaker mounting holes and does not require cutting the door panel up for speaker fit. I've installed 1 but don't have the screw grommets for the other side

I measured the holes in the door for the screw grommet, they are about 6.5mm square, I found screw grommets for 8x8mm and 7x7mm holes. I'm wondering if the 7mmx7mm will fit...

Does anyone have a favorite supplier for OEM style plastic clips, etc and screws?

I need these:

Screw Grommet #6 Screw Size -Honda & Toyota (clipsandfasteners.com)

The site looks pretty awesome but I haven't dug into it a lot.

Automotive Retainers, Clips and Fasteners - ClipsAndFasteners.com