I believe Mike Elliot replaces them with bipolars. Which he claims sound better.
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illenmal do you mean altavistaaudio.com?
Rose6512, altavistaaudio.com has the mosfets that are used ones that are tested. On the website there is a suggestion for other parts but I think you have to have your tech bias the amp with the new parts because they are slightly different then the original types.
Also, you may have to replace other parts depending on what blew in the amp.
I have a back up SA-220 that also needs mosfets but I was thinking about getting the newer parts and I have been in touch with another Agon member who has a tech in VA who is doing the work for him. Email me if you want to chat about the repairs and other options.
Here is the website and options that you have: