Unanswered Lost Magnet - Replacement?

So one of my magnets apparently wasn't glued in properly and has popped out and subsequently been lost. Does anyone know where I can get an exact match? Or what the specifications are?

 

Robo can send them to you, they're like 50c each so I'd suggest get a couple for insurance. If you call their help line just get to the parts Dept and ask if they can just throw a couple in an envelope for you regular mail. If it's FedEx shipping it's more expensive. I just had to get one of my y-axis bars replaced and the little magnet price was shown in the email.

It's frustrating having one tiny part missing you have no idea where to get! I lost one of the z-axis switch screws, have no clue where to find such a tiny part, just made do with the one.