Maybe. The 551 will fit the frame but is meant for later tractors with a larger PTO clutch. Somewhere I heard the 551 has a different gear ratio than both the 450 and 451 so that it'll work okay on tractors with both the small and large PTO clutches, but I can't remember the details, nor do I know if that source was valid.
Anyway, a 364 or 450 will for sure work correctly on you 1811.
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