Frim
Elio Addict
I recognize the blind nut; it's inside the frame and just about inaccessible from anywhere but the front.
What I have done in the past for this situation is to grab that blind nut with vise grips, twist it back and forth until the welds snap, then let it drop down into the frame. Ok, that's the brutal part.
Next I had these heavy gauge metal plates about 1.5" x 3" that had a nut welded on it. It was U shaped like a big paper clip; and they were used for mounting aftermarket accessories like side steps, seatbelts, custom bumpers etc. You would cut a slice in the metal about an inch in back (or in front, depending on accessibility) take a punch (I used an air chisel) and you would do a slight bend on the metal furthest away for the slice you just cut.
Slip the clip in, and line the nut on it up with the hole. I would run a bolt into it, then drill a small hole between the hole and the slice, and put a 1/4" steel rivet in it to hold in position; take out the temp bolt; mount your shock (use washers or a small piece of metal tubing between the shock and the frame to copy the distance the old blind nut stuck out so the shock doesn't bind on the frame. Finish up. Take a break; you just spent 2 hours working your butt off.
If these nuts will help you out, I will mail them to you. They are 3/8-16