So what is the “official” size (OD x ID) for each?

I don’t have any in stock, and may do a McMaster buy of a superior material (as well as o-rings for the stop levers on various 60x IPs) like HBNR for all of these.

I know the 616/617 mechanical gauges can get a bit fluttery when the rings get old/hard/shrunk, so I’m not opposed to trying the dual sizes next OCI.

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)