Joe.. I'd put some stainless bolts from the inside...that way you have a "smooth" surface on the inside. I would use some "nylock" nut and stainless washer to assemble. Once you do that, you'll have some "clean" showing on the outside. I've seen some real "shallow" nylocks that should do a real nice job.
If there is too much of the bolt showing, just cut with a Dremel "cutoff" wheel.
I'd say you could use some "skull" bolts like the HD guys use, but, that might not be too good on the LT..... unless you want parts falling off.
Did the same job myself a few months back. Those screws are close, but I only make a mess trying to dremmel the ends off so left them.
I have checked the tires for marks, but they are obviously not touching.
I Have had a front fenda extenda on for about 6000 miles, used the screws supplied, i filed the ends back a couple of millimetres after installation, no problems at all, i probably did not need to file the screws, but i just felt it couldnt hurt anyway.
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