Bought the side armor from 4wheel online. eventhough they were drop shipped they arrived within 4 days and for a very reasonable rate. they installed easily and look great.

my question is there are 3 rivots, what they hell are they for or from?

second question is i fear rust. the nerf bars have a hole on either side. i was thinking of squirting some expanding foam to fill the hole. or should i just squirt wd40 in the hole?