Here are the part numbers for the offset woodruff keys:

621 991 04 67 2°

621 991 02 67 3°

621 991 01 67 4°

621 991 00 67 5°

I have found the 621 991 02 67 is the most frequently used key in the series.

On my 617.950 engine with the '05' camshaft, I needed 9° ATDC @ 2mm Valve Lift and with the stock key I had 11° instead.

The addition of the 621 991 02 67 key brought my intake timing to 7° ATDC @ 2mm Valve Lift which is 2° advanced from the camshaft specification sheet.

Since MBZ states the timing after 20,000 km will retard approximately 2° (from 9° to 11°) setting the intake lobe of the '05' (late style) camshaft to 7° ATDC will allow the engine to 'wear into' a near-perfcet state of tune as the timing chain stretches/wears.

I also advance injektor pump timing 2° (from 24° BTDC to 26° BTDC) to keep them both in the same relation to each other.

I hope this information is helpful...Bert