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With amends for the terminal nitpicker:
@Greenbank: You have implied the derailleur is being used in an 8 speed system, but the Deore M510 groupset was 9 speed. However given Shimano 7, 8 and 9 speed MTB derailleurs had identical cable pull ratios, they can be considered at least backwards compatible. Thus a replacement from an 8 or 9 speed groupset are candidates. But one from a 9 speed groupset should be easiest to find in unused or good used condition. You may have problems if you switch a shorter cage (GS) to longer cage (SGS) variant, or vice versa. Or jockey wheels are less than a tenner. Also the 'L' in RD-M510 -L just means it was black rather than silver.
chez_jay
That wouldn't stop it being used as an 8-speed 🙂