short step bed cross sill puzzle

[steverino66]

This photo shows all the cross sills I have removed, the ones with the tape markings came from next to front and back of bed, with long bolts through the frame (front bed panel and tailgate sills still in place on the bed).
Does anyone have a photo of all the cross sills in place on a short step bed without the wood installed? - I'm trying to determine how many/what type of sills I'm missing. I searched here and looked at Mar-K's site, no luck.
The side angle strips have 9 bolt holes while the center strips have only 7 - ?
Any clarification will be appreciated!