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They aren't stock so there are no specs. Get in and out of your truck and pay attention to where they should naturally be for easy mount and dismount. I did that, and then moved them just a few inches back to suit my visual taste.
Oval head machine screw in stainless looks good for mounting.
Ed, Dewayne is right. The step plates need to be mounted where you can actually step on them. Most people will just center them to the door. If your feet are like mine, then that makes it almost impossible to get in without tripping. Good luck, John
I recently mounted step plates on my 56 F100 Custom Cab. I found that by centering the plates below the Custom Cab Emblem (center of the side window) that the step plates ended up in a good position for me. It looks good too! Also, I applied some 1/32" thick rubber tape to the back of the plates so that they would not damage the running board finish when the mounting bolts are tightened. This should prevent rust in the future from starting behind the plates. Good luck.
Redf100pu
My step plates set on thin nylon washers to keep them off the painted surface. To even out the difference in the rib heights on the Dennis Carpenter boards, I needed two washers in some places.
Thats why I've never seen them. It looks like they're in the Model A catalog. The images aren't showing on their web site now so I'll have to check it out later. Thanks.