On Sat, 10 Sep 2011 11:26:10 -0400, wrote:

There is usually a number on the bearing that will cross.

I don't know if I mentioned but "6203D" is on my bearings.

Googling, I find LOTS and LOTS of the metric 6203 bearings (17mm ID x 40mm
OD x 12mm wide), at prices so scary as to make postage a bigger concern!

For example:
http://www.thebigbearingstore.com/se...al-Ball/Detail

* The 6203-2RS ball bearing has two contact rubber seals one on each side
of the ball bearing.
* The 6203-ZZ ball bearing has two non-contact metal shields one on each
side of the ball bearing.