The turnbuckle and rod attaches between the main bar and a lever on the switch and provides the mechaniocal link so the switch knows when the car is out of level.
There is a
NOS 56 switch on ebay now which was the later version and was a factory retrofit to 55s but you will need to change the wire terminals on your car to hook it up. Not hard to do and having the wires in a weather proof enclosure does help longevity. Maybe not as important on 55s because everything else electrical is exposed but there were corrosion problems with the 55 switch terminals in wet climates. In 56 almost all the TL electrical was moved or better protected.
Kanter and Max Merritt will have the switch in a reworked version which has the time delay working on modern solid state electronics instead of the original heated bimetal strip. Kanter doesn't have a website to view the item but here is
Max Merritt's offering of an original 55 version which will drop right in. He doesn't mention exchange or a core charge but there may be one so without an old switch to send in his or Kanters may not be feasible.
Mike Dulinski in Minnesota (218 721-4631) or Gerry at Packards Southwest
gerry@packardssouthwest.com may have used which would most likely be serviceable as is. As with all used and particularly electric items, anything approaching 70 years old may at the least need the contacts cleaned before putting in service and at the worst it might not work.
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