I the early days of mth diesels, they didn't really have product numbers. I have a contrail c30-7 from 94 that's the same way. The older electronics can be a little fickle but in conventional operations they usually work just fine. Just open it up carefully and look at the battery. It will look like a 9 volt. If it's white throw it away and order a green one. The white ones are original and can leak.
There's another item called a bcr or battery component replacement which can be used as well, but for your purposes a battery will do fine.
