Any tips to fixing stripped drip rail and wheel arch moulding holes

[hrc200x]

As I'm piecing together my truck I've found 3 drip rail and 6 wheel arch holes that are stripped. Any tips to fixing these?

I ordered the wheel arch trim from LMC so all the screws match and it would be nice to leave it that way, otherwise I could go to a bigger size.

Of course truck is already painted so welding closed and redrilling isn't an option.

Also any tricks to installing the drip rail trim? Seems there isn't enough room between the trim and bolt head to get it started easily, fitting a socket on it is impossible and I don't have a wrench small enough. They must have changed head sizes from 83/84ish to 85?

Thanks.