New Holland MT40511370 is the sensor Clinton Tractor supplies for this application. It is listed as fitting 9 New Holland models.
What MT40511370 fits
Fits: New Holland BOOMER-40, New Holland BOOMER-45, New Holland BOOMER-50, New Holland BOOMER-55, New Holland BOOMER-35 + 4 more. Commonly ordered for the BOOMER-35, BOOMER-40, BOOMER-45. If your machine isn't listed, check the serial number before ordering.
Which numbers it replaces
MT40511370 replaces MT40273645, MT40379940. If your parts manual or the old box shows any of those numbers, this is the correct current replacement — no fitment change.