At some point, the prechambers were changed so that the injectors sit at a 15 degree angle (just like the ones in the 605/606 engines) rather than straight up.

I don't know if they are interchangeable, but I believe the injectors are. Would have to check the manual to make sure, though.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!