Hi Marty. They are M8 eye bolts in 316 stainless steel with flanges (shoulders). I got them from a marine equipment shop (chandlers). You can also get them from industrial fasteners supplies. I paid about $8 each for them (about 4 pounds). Get a long shank and cut them down to the same length as your rear guard bolts. You will need at least 34mm shanks for the longest bolts.

Cheers, Richard
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09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge