Dirty secret: The RCA test jigs were rebadged Telematic Jigs. If I had access to the books for my jig right now (I don't) and knew which model jig you've got I could read off the adapters you need. I don't have time to open my Zenith 29JC20 to confirm, but next week onwards I may swap the CRT on it (one in it takes ~20min to 2 hours depending on the number of days powered off to reach usable brightness)...IIRC the yoke or convergence plug does interlock the horizontal B+.
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