Can I use the left cup from a 118 mm BB-UN55 on my 107 mm BB-UN55?
I have a 107 mm BB-UN55 bottom bracket without a left cup. Can I use the left cup from a 118 mm BB-UN55? Are they the same? Bikester[1] (and many other places) sells what looks to be a axle length specific 107 mm left cup/shell for the BB-UN55. Are the cups different depending on axle length for the BB-UN55?
Valuable frame (to me), so I'd rather not do something damaging.
[1] Can't post a link as I'm a new member.