Am I correct in saying that a 1450 has a manual clutch and an 1811 has an electric clutch? If so, I believe the mule drive is also different in the exact positioning of the pivot point for the pulleys. The belt drops down a little further forward in relation to the main frame of the tractor on the 1811 VS. the 1450. I don't believe the mule drive from the 1450 will work on the 1811. I stand to be corrected if wrong, but that is what my understanding is.
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Matthew B 
1972 129 w/hydraulic lift and head light option soon to be repainted
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