at the request of another reader, here are some pics of various space bars
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Top to bottom original space bar from Leopold Tactile Force Tenkeyless; WASD keyboards space bar with posts glued in for Noppoo Choc Pro and Cherry; Cherry PBT space bar with extra post glued in for non-Cherry keyboards.
Calipers in 1st pic are set to C-C distance for Leopold stabilizers; in 2nd pic set to C-C distance for Noppoo stabilizers.
Sadly, I can't be any more precise on my Noppoo measurements because the stabilizer thing was apparently glued into the space bar on the original Noppoo space bar, so I had to get a little rough with it to make my gluing jig. However the one pictured has been working fine on that keyboard.
Based on what I see here, if someone wanted to make a truly universal space bar that would fit Cherry, Filco, Leopold *and* Noppoo, the stabilizer mounts would be awful close together, might require a new wider design for the stabilizer posts with a double cruciform to accomodate both Leopold and Noppoo.
I swear there was a thread earlier where someone had posted dims of the Leopold and I'd posted the dims of the Noppoo and it kind of looked like maybe a Leopold space bar would work on Noppoo, but after actually acquiring a Leopold (today was the first time the space bar was off of it) I don't think that that is feasible. The dims have to be exact for the Cherry-style stabilizer on the Leopold and I think it is too far off to work on the Noppoo, even though there's a little allowable slop with the Costar design.