It fits in a double-width dvd case [such as those that hold 8 discs], you just need to remove the little disc holder/release button thing.
They're slightly taller and wider than a UGC though, so not recommended if you're going for a uniform look.
But for anyone in PAL regions where the UGCs are a) expensive to ship, and b) not too useful as the SNES games are a different shape, these 8-disc dvd cases are a more than adequate substitute. Covers printed at their normal size leave about a 3mm gap at the top of the case, but look good regardless, in my opinion.