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Data Sheets or specs for power transistors SJ6915 and GM DELCO 900-6500

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RJTR:
I am working on two old BioRad 500v power supplies. One uses Motorola SJ6915 and SJ6916 transistors for pass elements. The other uses GM / DELCO 900-6500 transistors for pass elements. The circuit is almost identical to the MC1466L datasheet 250v 0.1A application circuit. I have tried contacting OnSemi , Digikey and just about everything I can think of to get a some data on there devices with no luck. Does anyone have a technical reference for these devices ? They are NPN devices in TO-3 case with Vces 1200v (approx)  Vebo unknown  and hfe unknown. I would appreciate any information the form could offer.

Benta:
The Motorola parts are custom marked, perhaps even selected parts.
They would probably be MJxxxx types (2Nxxxx also posible), meaning bipolar power transistors in metal case (TO-66?) Ne way of telling which, but the selection wasn't that wide in those days. An old data book might help.
The GM/Delco? No idea.

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