Also, where do I look to figure out which engine I have, so I can order the proper glow plugs. Apparently they are specific for different years of the OM616.912.

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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

Any of the Diesel Engines in a W123 from 1980s on use the same Glow Plugs as mentioned; Bosch 80006.
Shop around on the Internet as they are about $9 each. Pad the order with Oil and Filters and Valve cover Gasket to go over $50 and get the free UPS Ground shipping.

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84 300D, 82 Volvo 244Gl Diesel