longbed questions.

Alright guys, im bagging my ext cab and want to do a longbed. Problem being, that my longbed i was buying fell through, so now being in the process of stockflooring it im kind of in a dilema. It seems kinda crazy but id like the measurements from the outer bedside so i can build my frame and notch without actually having to have the bed. What i need if anyome has it is the measurement on the outside of the bedside from the front of the bed to the opening of the wheelwell, and the distance of the wheelwell opening and from the back of the wheelwell opening to the back of the bed, any help guys?