Replacement bottom bracket cups?

[elspedo]

Morning all, I've just taken the bottom bracket out of a bike I picked up a few months back as the spindle length is too long and the (plastic) cup/lockring? has a hairline crack running perpendicular to the thread.

Is it possible to get just the replacement cups from anywhere as the BB is fine and may come in handy in the future.

 

[FMJ]

If your lbs is anything like mine it will have drawers of them and will give you one.