Need help on stepside bed wood install ??

[Botietruck]

I will be starting on the final phase of my 13 year restoration project this week. I will be installing the oak bed wood kit. The wood has been routed for the metal strips and the lengths and widths are correct. The only thing missing is the drilled holes. I will be using forstner bits to drill the holes, but the one thing I am somewhat unclear of is the proper way to drill the large holes for the offset washers. Is there a pattern to follow? Should all 8 offset washers be in the same general position? I'm sure someone has done this in the past and will know what I'm talking about. Any ideas.

Thanks!