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Most of the older style cabinets out there have a rack mounted 24Vdc supply that is just only that- the 24vdc supply.

Then came the PDA#2 that have all the breakers and also houses the 24vdc A.K.A. "206" power supply.

1) I'm finding it difficult to find a vendor for a replacement for the old style 24vdc. Does anyone have a lead?

2)
Since the 24vdc outputs are Identical between the two styles ( based on the DC fuse rating being the same @ 6.25amp) Is there a product out there that lets you upgrade the old rack 24vdc with a rack adapter that accepts the 206 style power supply?

Safetran makes those power supplies still! I've got the part number ready for you, I'll send an email.

I'm not sure about the adapter you're asking about. I would think it might take some work to fit a PDA style rack into one of those cabinets if it wasn't designed for one; you'd have to rewire it to get all the signal circuit breakers in there. I've never seen one myself though so I'm not sure, it may be easier than I think.