Fastlane or the dealer can hook you up.

A battery is a battery Sears, Autozone, or the MB dealer can get you one. I like OE batteries personaly.

I have not changed that hose myself yet, but I probably will next year since it is getting old. But it looks like a simple job. I'd buy a ps filter and some ps fluid then do a flush while you are at it.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200