No, I think they may have all had oil separators. Yes, the early ones did have the diaphagm pump. My '80 has a piston pump and had an EGR valve, but mine was a California version so the 49 state version may not have ever had the EGR.

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)