Model A cab mounting holes

I have a question, I have an old frame that I'm using to build up new sub rails for a 29 closed cab pickup, there are no holes in the frame for the rear cab mounts, did ford only drill these holes when building a PU?
The cab has been taken apart but luckily I have enough parts to uae as patterns, I'm going to use a boxed perimeter frame.

Thanks

 

i always was told that all the frames were the same . but i never have owned a pick up ........... good luck

 

Steve thats what I thought, but......

 

Your right on, the pickups had the extra holes drilled when a frame had the pickup body going on it. Otherwise the rails are the same for the cars & trucks if built on the same day.

 

Thanks