@Kleensleeper, yes most do break, lol. The screws for the lip are the worst. I found it best to go ahead and force them to break if they are seized. If not they will rip holes in your lip if that metal clip spins with them. I reused my clips by taking the rest of the screw out with vice grips and channel locks.
@jamanrr, exactly which pieces do you need? There's a few NXs near me at the salvage yard. They may have some good parts on them I can get for you. I've pulled parts for a few guys before. LMK if you want me to do that. I'm sure they have some usable parts left, and I have a stockpile of screws I've saved from other parts. I used some on my lip.