Below is an ILL of OEM install (complete service kit). Those washers look like they are from a 3C590 kit (steering cyl bushing kit).
A few years ago, you could buy the whole kit including idler arm, bushings, washers and castle-nuts. Now, some vendors are only selling the bushings.
If you had an earlier idler arm replacement from a kit, you may notice that the shaft portion is way smaller than the original, but they cast-in a couple of "gussets" at the base of the shaft to keep the shaft centered. Those gussets can wear-down and cause too much vertical slop in the idler arm movement. So if you can only get bushings now, it may not help if you had one of those aftermarket idler arms.
That second photo is a roller bearing kit for '54/55 (and would fit the '56 idler arm), but I don't think the old style was available at the factory anymore.This keeps bothering me.
Here is the bracket and large bushing that I knocked out. No bearings in it-just lots of rubber.
I do have a relatively early early car-I think. It is numbered 156915 from Norfolk. From what I have read you drop the ‘1’ so that would mean it is #56915.
Mike
SOURCE - https://forums.aaca.org/topic/120694-1957-t-bird-body-plate-decode/Consecutive Unit Numbers begin at 100001 for Ford cars, 400001 for Lincoln cars, 500001 for Mercury cars, and 700001 for Edsel cars at each assembly plant (where those cars were produced). This number represents the scheduled sequence order. When a car was ordered, it was immediately assigned a VIN with a Consecutive Unit Number. It was then assigned a scheduled production date based on availability of trim, parts, other components, and taking into account downtime and production workloads at the assembly plant.
A scheduled production date was very often out of sequence with the Consecutive Unit Number. And more often than not, the actual production date (the day the car rolled off the line) was earlier or later than what was originally planned.
Therefore, a Thunderbird with a Consecutive Unit Number of 105678 may have actually been produced and ready for shipping before a Thunderbird with a Consecutive Unit Number of 105432. The Consecutive Unit Number should be considered to be a unique identification that shows when the order was received and when it was planned for production.
Thanks K,
This car is so banged up anything is possible. IT may have been rebuilt/replaced decades ago. But will start looking.
Mike