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Also a handy reference and parts source is XKs Unlimited, Jaguar XJ Parts Master Catalog Series, This one has great parts illistration's
Also SNG Barrett catalog
In your photo # 1 is the ALT adjuster. #2 is the Power steering. #3 is the compressor (AC) and A/P adjuster. The jockey pulley (J) is the tension device for the Fan (F) under the Fan attach point.