Cage nut question

[Geo's66]

guys, need to replace on on my 78 Monte. Anyone know where to buy the exact ones we use? What size are they? Since I'm doing a frame off, thinking of replacing all of them vs waiting for disaster on reassembly-thoughts on that? Thanks, oh, where have you bought them?

 

[pontiacgp]

I made my own and there aftermarket cage nuts but none are reproductions...

 

[565bbchevy]

I also made my own using 1/4" steel plate squares with a hole in the center then I welded a grade 8 nut to that.
I also used grade 8 bolts with a standard thread that was one size larger than the metric bolts that were in there.

 

[Geo's66]

565, did you use the bolts that are sold by sources like gbodyparts and then match a nut to them? Did you guys build some floating cage to have some leeway or did you rely on getting it perfect? Can't believe they're not reproduced!? Also, I guess I can drill some access holes from top, get the bushings/bolts screwed down, then weld the access "flap" shut or use some rubber plugs for those holes? Am I on right track here?

 

[V8 Rumble]

If you need the rear frame pads you can them here http://www3.sympatico.ca/conradlozier/

I bought the rear frame pads for mine and these are nice pieces.

I only used the right side ones since my left side floor was good.

 

[565bbchevy]

When I did mine I plasma cut access holes which I guess could have been called a flaps, I cut out all the factory cage nut junk and then bought the grade 8 bolts based on the length and diameter I needed.
After I made all of my body mount nuts I installed all of my body mounts and then installed all of the bolts hand tight and then made sure the body was square and then put a tack on each nut.
After that I tightened all the bolts and fully welded the plates in place and closed the flaps and welded those shut.
Next for me was installing the roll bar.