It will fit with modifications to the drive sled (read: cutting metal.) The vertical SIMMs are generally too tall, the 3000 version has angled SIMM sockets (and only two of them for 64MB max, at that. 4000 version supports 128MB.)
edit: also, the SIMM sockets stick out further on the 4000 version and may interfere with part of the case, I seem to recall this issue as well.
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