I looked in my K-series manual and the A means special oil pan. I believe the K301A oil pan is smaller in front and larger in back. Somebody correct me if I'm wrong. My 680 has a k301AQS, so I know what the oil pan looks like.
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Kris
63 CC Original w/ 38” deck and front plow
72 129 50” deck, 42” blade
73 86 42” deck, 42” blade
84 CC 680 w/50” deck and 42" plow
89 CC 1811 46GT" deck,QA42A, 38" IH 1A tiller, Brinley-Hardy plow x2
1982 Gilson Lawn Tractor with 38" deck 
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