It appears that ARB solenoids have changed a little over time. My old solenoid valve body (on the left) mounts does not use a screw-in stem like the possibly newer style on the right.
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They both use the same style of electrical switch-thingy. However, the solenoid with the screw-in stem requires a rare sized O-ring to prevent air leaks. My old solenoid does not. I was able to swap out my broken electrical switch-thingy with one from the other style of solenoid, skipping the O-ring, and it does not appear to leak air.
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