You are a day late and a dollar short. 
My mantra.....ALWAYS read ahead before responding. 
I read your post about those components earlier and I wouldn't insult your intelligence by even recommending that ... 
I'm not insulted nor offended. I knew the Captain Obvious's would come out of the woodwork and I would have to explain my motivation.
To someone who had to repair a lot of stuff over the years, always with time pressure, your motivation seemed a bit esoteric.
My rule was that of the three things:- Form, fit, & function, the most important was function,
Thus, equipment often had components of higher voltage rating & even, sometimes, of different type fitted as replacements, especially where the original was "unobtainium", or of inferior quality.
One Electrohome Pix monitor used, for some reason, a high voltage rated bipolar electrolytic capacitor as part of a DC supply off an overwind on the EHT transformer.
As these things do, it died, so I looked up the catalogue for one of our usual suppliers, & was delighted to find they stocked the same value at that voltage rating.
They were much smaller, too, So, marvelling at the advance in technology, I fitted one.
The monitor "rustled up", everything looked good for about 5 seconds, then with a hissing sound from the new cap, the original fault returned------Yep! the originals were low ESR, the new one, not!
More chasing through catalogues, phoning, etc, revealed that low ESR BP caps in those ratings were not available in Oz!
Maybe in the GWN, where the EHome hailed from?
Anyhow, it ended up with a "Christmas tree" of polyester "greencaps", was returned to service.
Definitely looked uglier inside, but EHomes we pretty ugly, anyway----hardly Canada's finest product!
My view is that, even with "collector" type stuff, work performed over the years (like, maybe the 50v cap in your case), is as much part of the devices history as the original configuration, so fitting a higher voltage rated cap now is just as legitimate.
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