You won't find a direct replacement most likely. Between, core types, winding counts and other particulars, there are a near infinite number of permutations. Almost all transformers are custom wound. Most of this work has gone to Asia and tends to be high volume. There are some prototyping houses that can do small quantities. The good news is that this is a very complete build spec for both versions that gives you some flexibility.
If you're re repairing a piece of equipment and have a bad one of these, you could carefully disassemble it and rewind it. You'll need some .1 mm wire and some good tape. Follow the spec. Its really not very hard- if you access to a metal lathe, it can be easier. If there is someone local that does transformers, they may help you or give you advice. Its a low turns transformer (30 to 60 turns) which make it simpler. Its tested with a standard Chroma 3302 Xfrmr tester that is very common in the trade. The only electrical spec given is that its 440 uH at 1Khz for 30 turns, others turn counts will scale with turns^2. A 1500V high pot is not a high rating and is easy to approximate with an appropriate voltage source and DMM. If you have a working sample, you could figure out what the core material is by bench testing it and working back from your spec and turns to give you a composition and Al value. You'll need an audio generator and oscilloscope at the very least.
If you want a larger number, you can research those suppliers and part numbers in the bill of materials and get those cores or substitutes- a contact in Shenzen could be a help most likely. These are likely established businesses. You have to know the type of ferrite, its frequency range and its Al values, etc. Armed with that you could get the compatible bobbins and cores and wind your own. If you can't get what you need from China, there are western companies that sell all that stuff (West Coast Magnetics and Philips Ferroxcube are two that I've used). These usually use nylon bobbins and pot core construction for very low volumes. These are really easy to wind. You can compare your sub to a working sample if its available.
There are a lot of custom transformer companies. One of the bigger and best known is PREM in the US. The problem would be minimum order quantities. You could send them the spec that you have for a quote. Ask for some quantity like 100 pcs so they will respond. Be honest about your final annual useage, if its just a one time 100 pc build, say that. You'll likely have to take some minimum order like 100 pcs.
If you share more of what you're up to, I might be able to help more. What kind of equipment did this come out of- what is it doing?
Good luck. Doing this the first time is hard but it gets a lot easier.
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