It does not have to strictly be a 212. Anything in the x12 range will do you. The first number only designates the original fitted hard disk size which will probably not apply to what you intend to do (unless of course you REALLY only want a 20GB hard disk!). The only exception to this is the 612 had predominantly silver front panel.
My website might give you a couple of more options than ebay as well.
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