Miller tools???

When I bought my Cuda there was a big box of parts and stuff in the trunk and I found a couple of Miller tools in it but am not sure exactly what they are for. I tried google'ing the number on them but didn't have any luck finding them. One looks to be a bushing driver and has a Miller #6757 and the other is just a round shaft about 1" dia. by 5" long and is Miller #6312. Does anybody have any idea what these are for?

Thanks, Tracy