One key looks original (old), one looks very new, and a third is brand new. They all seem to do the same thing. I use the original most of the time, figuring it will eventually go south first.

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport