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And a follow-up....
A few years back, we pulled the engine with all of its accessories from a scrapped M920 and dropped it into an International 2574 which is a 12V truck. I don't recall that we replaced the starter.
Check your TM for the M920. The starter may already be 12V.
I don't have an exact answer to your question, except as a former M920 owner.
I think the new starter will work just fine so long as it bolts up, and the Bendix/pinion length is the same as the original. Placing them side by side on the bench should confirm.
I recall that the engine is...