Jerry, the rear bolts...smaller ones, can be fed in from the inside out after you remove the nut cage. I just used a SS carriage bolt, then you double nut it from the outside. I used a thick washer against the chrome fender rail, ~1/16" thick, then double nut it at that point. Does two things; it will pull the square section under the head of the carriage bolt into the inner part of the fender, and the second nut locks the bolt in place. The two nuts also act as the needed spacer, place the saddlebag rack in place and I use a chrome nut on the outside. The front bolt is a bit more involved. It screws into a welded plate nut on the inside of the fender. I picked up a full threaded bolt and cut the head off, then by using a double nut it will let you screw it into the fender. Once in place, the double nut will work as a spacer, then place the bag mount on and put a chrome nut on the outside. I have a couple closeup pics if interested.
I follow,

looks like I have another project. I believe I better do the 800 Drifter first. Oh and nut cage done on this one.