Thanks, all. I'll give it a try with needle-nose pliers, then an Easy Out. Biodiesel300TD ... I'll let you know if I need the arm ... that would be great, it is indeed the driver's side and I think a 77 would be the same. Hopefully it'll come out for me and I can just pop a new bolt in there and (carefully) torque it on. Lesson learned.

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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)