@ Little Darwin.
http://www.amazon.com/Shimano-PD-M324-Dual-Platform-Pedal/dp/B00AZ2OID8/ref=pd_sim_sg_3?ie=UTF8&refRID=1FBHM1E5BRKQHAJDESD0
My error. I thought all Shimano dual platforms would be the same. The above is what I have, and I used the existing holes, two of which on each pedal are not used. After looking, I see I saved some labor by only weighting the right side pedal as I never clip into the left side when I'm moving.
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Some people are like a Slinky ... not really good for anything, but you still can't help but smile when you shove them down the stairs.