For reproduction parts, there is a helpful and extensive Links section on Stovebolt.com

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My ujoint broke and then proceeded to grenade my bearing retainer plate and the front and rear yoke. The transmission is the muncie 4speed sm420 and the torque tube yokes front and rear.
Post a Parts Wanted ad in the Swap Meet. Novak may sell that cover/retainer, but I have never seen a vendor selling that cover/retainer as a reproduction part. If someone has found that part in reproduction, it would be helpful if they posted the vendor and part number.