The M900 one is the SS one with the side mounting lugs cut off the side of the battery tray.
Other than that they are the same, and if you look at a M900 one you can see where the mounts have been cut off.
The M900 then uses bolts through the bottom of the battery tray to mount to the frame instead.
I had both side by side on my bench @ 3yrs ago and discovered the above.
I have one of each that I could be persuaded to part with if you need one.
Nasher.
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Heaven doesn't want me, and Hell is afraid I'll take over.
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