4 inch square front bumper Feb 23, 2019 0:14:44 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by maddmaxx on Feb 23, 2019 0:14:44 GMT -5 thoughts on using 4x4 square 1/4 thick as front/rear bumper.no points, can use 10 inch's of flat or square to mount inside or outside.be on a 90's s10 regular cab.