55.2-59 57 3100 Hood Bumpers

[57FleetsideC4]

Hi, Have a fairly easy question today. My truck came loosely assembled and a lot of pieces not on. On the hood bumpers it looks like there are 3 on each side of the hood 2 on the upper grille bar in 5/16" holes and 2 on the cowl on for the rear corner of the hood. I can't find the posts for the rear ones. The hole size is 1/4x20 thread. I can find kits of the rubbers but not the post the rubber goes on. There seems to be a lot of 5/16x18 threaded posts. Anyone know of a source for these? Thanks Steve