hmmm, steering damper, to control shimmy on rough roads ... wouldn't be considered part of the frame if bolted on and with it's own tag/part number .... I think not all plants stamped the vin on the frame rail until late 57 and later and there's never any number besides that one
well you should hang onto them and try to track the full story for sure, but I'd say they're a fairly uncommon special order accessory
Bill