Merkur’s official Italian-made #904000000 frosted bowl for this stand’s of course a perfect fit, but there’s going to be a lot of little stands on the market that would likely fit in that slot.
It will certainly hold a pair of most safety razors, though if your model is >15mm at all points it would be the exception. The ‘gates’ are but 15mm wide, so when it comes to brushe I believe it may only fit the Simpsons ‘Wee Scot’ as well as Merkur’s two long-handled models that are “matched” to the ‘Futur’ and ‘VISION’ razors.
This Merkur stand consumes ~4.1 x 6.3″ (~104x160mm) WxH of your bathroom counter top space, and weighs ~7.9 oz (~225g).
Made in Solingen, Germany.