Device ID and Model ID are the same as for the MT-32. You don't need to worry about those since they're already part fo the SysEx, however.
Can you see any activity on the CM-32L's activity LED when you send the SysEx file? If not, then the problem is the connection. Check that the MIDI mapper is using your MIDI port as output.
There's a SysEx transfer utility for Windows called WSysEx. It's not pretty, but it gets the job done. I'm fairly certain it's available from Tom's "MT-32 Resource Center" (in the same zip as the "dump" utility for DOS). You can also find it here:
In general, anything capable of sending SysEx will do (even Media Player - although it would need to be embedded in a MIDI file of course). The CM-32L isn't picky or prone to buffer overflows like the MT-32 so you don't have to choose a program that will send SysEx messages with pauses to slow down the transfer.