The Lucas Oz one would be the later. Doesn't matter really.
BTW you really don't need to gut it out just to make a J-box. There are only a couple of wires that need joining, I'd solder the joints and put into a standard J-box, then keep both regulators.
If you don't want to solder the wires together, use bolted ring terminal connectors.
<edit> my 850 was done by PO without the regulator box, I'm going to fit J-box as said.
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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.