So the running boards were a good deal and I went ahead and bought them anyway. I can't comment on the rear fitment since I don't have rear fenders, but up front they are a bit different. They match up to ~60% of the '46 front fenders starting at the cab, but towards the wheel opening the early running boards are longer. They do look like they'll work with some trimming. Can't tell yet if I'm going to have to shift them forward or back any to meet the fenders properly, but it doesn't matter because the mounts need replaced anyway.
