The 08 Road Glide does not have brass inserts , it screws right into the plastic outer fairing , the plastic is threaded to accept the screws . It can be easy to strip if you dont know what you are doing , you can not use a air or electric screw driver , you can use a 1/4 inch drive rachet with very little tourqe applied , I use a tourqe bit screwdriver for the best results . I do not believe that there is enough material on the outer fairing to install the brass insert or HD would have done that in the first place . The 4 short screws should be tighten to 6 - 12 in-lb the 2 long screws should be tighten to 10 - 15 in-lb according to 08 HD touring service manual . HD should have a repair proceedure or the only other repair would be a new outer fairing . It seems that everytime I take the bike to the dealer it gets a new scratch or something & now this happens .
I didn't know the 08 RG doesnt have the inserts,something I have done on ABS tubing would work ,heat up a butter knife and melt a bit of ABS into the fairing,like you are using a spatula,then clean it up using a dremel and drill and retap (I'm assuming the RG fairing is made of ABS like the EG is)