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Drop arm for 6-bolt PAS box - is it the same as 4-bolt?


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Per the title really - the 127 has a Gemmer 6-bolt "heavy duty" box and I'd like to source a spare arm for it to rebuild the ball joint, but it's not entirely clear if they share arms with the more common 4-bolt boxes?

RTC6398/RTC6399 is the part according to LRWorkshop (not sure what the difference is?) where the 4-bolt flavour has a different part# so there's clearly something going on.

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My understanding is that the Gemmer and Adwest boxes have a different taper/spline for the drop arm, and so are not compatible.

A 4-bolt Adwest will take the same arm as a 3-bolt Adwest. But a 6-bolt Gemmer is different.

However the 4-bolt Adwest and 6-bolt Gemmer both take the same (metric) pipe fittings, whereas the 3-bolt Adwest takes different (imperial) fittings. 

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