I don't think there is any reproduction stuff like that for F3's so you will have to search for used for running board and cross member. I have the same rims on my truck as you do but I think they are the wm. As for rear end I am not sure what would fit with the 8 lug wheels. I know a 9" rearend from a 57 - 72 F100 will fit your truck but they are just 5 lug wheels. Also if you put your location down maybe someone close to you may have the parts you are looking for and be able to help you out a bit.