Thanks Afshin !

I stopped at Sam's club yesterday to pick up some things and they had the Optima (red & yellow) but they don't look like a good fit. Wrong post orientation, smaller etc...
They also carried the Interstate. The model for the 500E was a HD93? or something like that. It appeared to be very close in looks to the MB battery. It was 850CCA and 155 reserve cap.
Same size but black....I don't recall it had the nice MB handles.
I think the MB battery I have is 450CCA, so the interstate may be a better battery for the money. Mine didn't last very long....
The price was approx. $90 for the interstate and same for the MB battery at wholesale from the dealer. I will price a CL600 unit at the dealer today.

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Bryan Harter
1992 500E Smoke Silver
2002 CLK55 AMG Cab Silver/Black
2001 Harley Fatboy - Pearl White
2004 F150 FX4 Silver/Grey
1969 GTO Liberty Blue
1956 F100 Black