Finger Guard Nuts

[HighSchool66]

1966 Lemans
Could someone please tell me how to bolt on the fan finger guard? Specifically, what kind of nut goes in the 1/2" inch square holes of the core support?

I can't find plastic quare expansion nuts big enough.
Standard sheetmetal U-nuts (or J-nuts) don't seem to fit right.
Cage nuts, maybe?

 

[melsg5]

look in the GTO catalog from www.amesperf.com part number P148

 

[HighSchool66]

Perfect. Thanks! That is not an easy part to search for online. Google failed, and my usual sources like OPGI and ThePartsPlaceInc don't seem to carry them. Guess I'd better add Ames back on my list.

For anyone else reading this, the answer to my question was #3, cage nuts.