Great. Thank you all for the feedback.

Next question: How important is it to ream the glow plug sockets when replacing? The reamer costs ~$90, so I'm running a cost-benefit analysis in my head. . .

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1982 240D - 292,000 miles and counting
Same family for 33 years
Newly rebuilt Monark injectors
Newly replaced clutch
New Bilstein shocks

A factory made Glow Plug Reamer for your year and model can be had on eBay for about $37 from El Paso Tool or Zedmak Tools.

Or as mentioned you can use a alternative method.

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84 300D, 82 Volvo 244Gl Diesel