“The good thing about standards is that there are so many to choose from.”
Fabrication times etc. permitting, I will soon be shipping 1U tiles with faceplates conforming to both the Intellijel format (~39.5mm tall) and the Pulp Logic format (~43.5mm tall). Currently, the supplied faceplates will only fit in racks which conform to the Intellijel standard - these are generally 1U tall with an upper and lower 'lip' on the rack.
There are other bargains to be had too ...
A few years ago, back in the 'Perspex Period', I made a number of 1U tiles available - whilst they sold well enough, it was pretty obvious that in terms of format I'd backed the wrong horse; most folks seemed to have Intellijel-format tiles whereas I offered Pulp Logic-format. Unfortunately, due to the size of the PCBs it wasn't possible to retrofit the tiles to an Intellijel rack without some serious hatchet work.