The problem you will face with most Wade & Butcher blades is not the blade size (6/8, 7/8, OMG, etc.). It is that W&B's are generally longer from the pivot hole on the tang to the point. They won't fit in most modern, factory replacement scales. Your options are custom scales, and well, custom scales. SAVE the old scales as a pattern for the replacements!

The other obvious idea is to find another like razor on eBay and transfer the scales. I only do this for certain razors where the scales are identified closely with the blade and maker, for instance a Wonderedge.