In the past, I've gone to Best Buy or Circuit City and looked at the aftermarket remotes. They usually have an extensive listing of what the remote will work with. You can probably do this on the websites of the remote manufacturers as well. I do know that most of the remotes were compatable with a wide range of Nakamichi products when I have checked in the past.
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The best place I've found for information on remotes and codes is http://remotecentral.com.
I did a quick look and information for the Sony RM-VL900 universal remote says it is preprogrammed with information for Nakamichi cassette decks. I've got a Sony RM-VL700 that is a great, inexpensive universal remote so I suspect the 900 would be similar.