Fabrication question

[Unresistible Blue]

As an alternative to tapping acrylic sheet, I'm looking for a source of plastic splined panel nuts like what you see at the bottom of this page http://www.plasticnutsandbolts.com/nuts.html, but I need them for a No. 8 bolt. Anyone know of a source? MicroPlastics doesn't have them either.

Thanks
Russ