Went to Pull-A-Part today, pulled 3 cold start injectors, 1 beige one, 1 black one and 1 blue one. The blue one seems to be the closest match in terms of tip length. I will try swapping this out in the morning.

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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)