Siemens S7 Key

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Hey Guys. I'm looking to get my hands on a little blue key for the Front panel of a Siemens PLC. In the plant here we use S7-400 PLC's and The Little Mode selection Keys at the front to switch between RUN, RUN-P, STOP and M_RSET are kept in the Panels on the front Door. The Philosophy is that unless you know how to use them, you can't accidentally reset the PLC with the switch. The Problem is that As they are so accessable, all but a handful have gone missing and the few left are a commodity. So to cut a long story short, does anyone knwo where I can get my hands on one... In Ireland if Possible! Any Help is appreciated guys. Thanks in Advance Alan.