Cub deck sizes
I have a 42 on my Model 100 (which it came with). I have some tall and lush grass over the septic field, and the 100 doesn't like to cut it easily, I have to slow to 1st gear and raise the deck a half inch to get through it usually. Now I recently got a 124, put a 42" deck under it, and it will cut through the grass in 2nd without much trouble.
I am planning to put a 38" deck under the 100.
I would recommend a 42" (maybe larger) for your 126. It depends how much grass you got to mow and thickness of growth.
Just my $0.02.
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