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2 rubber seals and a spring. We threw in 4 Phillips head M4 mounting screws because the slotted heads of the factory originals are probably toast by now, especially since the sexy sheet metal bracket that curves around does a great job of blocking access.
You will have more success off-axis, with a Phillips driver/bit.
The 'quick fix' solution of throwing new seals at this valve sometimes isn't...a quick fix. The third photo shows a customer's valve where corrosion in the bottom of the valve body was preventing the serrated piston from moving freely, which in turn stopped the pushrod moving, contributing to the leak.
Would you prefer to have us rebuild, test and warranty it for 12 months? Get in touch.