Hello Hanah
https://www.startermotoralternators.co.uk/ is a great company, especially if you know your alternator’s model number, but they would be my go to company.
I think the H200s are on the Toyota EPC. The link for my van (a ’92 H100) is this: https://toyota.epc-data.com/regius_ace/lh119v/114894/. You should be able to click up through the site and then enter your model number to narrow things down.
Antodoc might also be useful, but possibly only with the model number for your alternator. Autodoc isn’t always great for JDMs, especially if you don’t have a VIN, but have a look.
I list a whole load of other resources, site etc (mostly aimed at H100s, but maybe useful for later vehicles) within the longish first post on my show us yours page. I can’t guarantee it’ll have the exact answer you need (hence pointing your straight to startermotoralternators) but a lot of the merry-go-rounds in Toyota parts lists and JDMs are addressed, rather than answered, there.
Good luck!