Kit B looks like the kit you need. Looking at the templates below each kit, kit B is the Narrow frame kit (which you need) and kit A is for a wide frame (which you don't have).
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John
Proud Owner of a Model 100 and a Model 124.
A homemade cart, 2 x 42" mower decks, a 38" deck,
a 42" front NF blade, and a lawn sweeper!
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