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After doing a little research for David, I found that while the 1N1204A and 1N1204RA are in short supply, their 600v counterparts are not. The 1N1206A and 1N1206RA are in stock at several suppliers, Mouser being one, for about $6 each.
These days it's not surprising that they quit selling the...
Yes, but all diodes have positive anodes and negative cathodes by definition. The thing you want to be sure of is which three have the stud as the cathode and which have the stud as the anode, since there are three of each in the assembly.
Plugging the part numbers into octopart.com shows several suppliers of small quantities. You may not be able to get both from the same supplier at the moment, I didn't check that thoroughly.
Alternatively, you can probably find diodes with similar or higher ratings with the same packages...