Front bumper bolts and spacers

[bobgreco]

When bolting up a new front bumper, am I supposed to put anything on the length of the end bolts and under the spacers (never sieze, grease etc.) or just bolt them up dry? I would hate to get corrosion or something happening in the parts I cannot see and keep clean.

Also should there be a washer and or lock washer on the end with the nut?

As always, thanks a bunch for the help!!!

Bob