Not sure exactly which sled you are referring to but www.eagleamerica.com sells 4 versions of a Coping Sled. I have model 2000. Works good for cabinet door rails.
This is a easy jig to make, pickup some 1/4" plastic and a hold down clamp or two and a mounting block...
You can use MDF/Brich plywood for the base plate and some hardwood for the mounting block you can get the hold downs from Rockler or just about any woodworking outlet..
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