FastLane here is as good as it gets. There are others, but no real advantage to using them.

The lever is broken because the heater valves are crudded up, causing low heater output and excess resistance to movement. Get a new lever and replace the old one, plus remove the valves, clean them, and replace the seals. Instructions are in old posts, a search should pull them up nicely.

One rotor is a rev limiter type, the contact "finger" is spring loaded and grounds out the spark as you approach rev limit. The other (cheaper) one is plain. Either works fine, but you are unlikely to over-rev the automatic unless you shift manually.

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!