Isaac, there are actually 100uF caps that have the same footprint. Let me see if I can find one...
SEK101M025ST Cornell Dubilier Aluminum Electrolytic Capacitors - Leaded
Well, that one's 6.3mm wide I think, so it would be about 0.6 mm extra beyond the silkscreen. The original BOM for the original version 2C controller had capacitors that had identical footprints for the 10uF and 100uF, and once that one went out of stock, I had trouble finding another 100uF that was exactly the same size.