There is a third mount ... thanks guys. It looks like crud, too, so I'll swing out to the dealer tomorrow and replace that too. Not sure if that's what's keeping me from getting the mounts off, but it might be ... I tried prying at the mounts and smacking them, and neither seemed to get me anywhere. We'll see tomorrow.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)