Here is the manual I was using
http://www.cubcadet.info/Manuels/Bel..._1947-2004.pdf
And here is a screenshot of what I am referencing. (pgs B4 and E14)
I have a 38" deck, I think it's a 38A, but it's the same P/N regardless. I also looked at the 44A deck and it also says a 3/8 belt
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-Jason
Cub Cadets: 1200 | 149 | 1650 | 122 | Z-Force S 54
Implements: QA42A | Push Blades | #2 Tiller | Rear Blade | 223A Utility Trailer | And a few mower decks
Gravelys 5260 | CI Walk-behind (Project)
And a couple of Subarus