What type of bearing do I need to replace a missing wheel on the

General CNC CNC Routers
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1

What type of bearing do I need to replace a missing wheel on the Y axis plate of a Shapeoko2? It looks like I have a spare plastic part to snap over it and I think I have the screw and nut to use.

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@ben_ward_FutureLab3D they use measurements but no common names. That is one problem. Also, I do not want to disassemble it a little to measure my bearing. Also, my metric ruler seems to be missing.

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+Peter van der Walt the 625 bearing dimensions match the 5x16x5 dimensions listed for one of the bearings. It sounds like they are available on OpenBuilds and I can surely find many more places with that common name.
Thanks, guys.