You are killing me here. Race secrets. I got no secrets.
Heres the link
http://www.mcmaster.com/nav/enter.asp?partnum=94579A400&pagenum=3127
Plain Steel Tab-Base Weld Nut Offset Hole, 1/4"-20 Screw Size, Packs of 50 $8.55
And go get yourself a box of 1/4"-20 bolts and knock yo' self out. I wish someone would make a 1/2" one of those the shortest I've found is 3/4". Short of parting them off on the lathe.....I'm running 3/4"s everywhere. I think you can take 90% of my buggy apart with a 7/16's socket or open end wrench.
These things are freaking lifesavers. I got lucky the 1st time apparently as they were exactly what I needed. I measured, checked catalog, remeasured, checked catalog, remeasured, and finally ordered.