HARRY - If you look real close to the inside of the rear wheel centers on a CC just outside of the flange the wheel bolts to you'll see the EWC and their part number unless you have a whole lot of paint on them or have ground, sanded or blasted the stamped numbers/letters off. There may be a date code like Art shows in his pic's too. Also confirms who made your CC's wheels with tires still mounted.
Every center had it's own part number, every rim did too, but they could be welded together in many different positions to customer spec's so there could be many final assembly part numbers.
And there were no "Bags" of fluid. The powdered Calcium chloride to mix with water did come in bags, but all my experience with CaCl was in liquid form. Dad & I put new tires on the Super H in the summer of 1970. Typically I could demount & remount the smaller sizes of large rear farm tractor tires in about an hour but pumping the fluid out then getting it back in those tires made them take a DAY each. The CaCl is very corrosive. Both water stems on those 57 yr old tubes leaked and were corroding the rims, I had to get it out. Each tire, 12.4X38's, held around 40 gallons of fluid, right around 500# of weight or a bit more, same or just a bit more than three pairs of wheel weights. For comparison, the '51 M has never had fluid and the 62 yr old rims still look brand new, but they've been repainted several times too.
ART - Those Firestone tires don't look that bad. I had some 23-10.50 GY turfs on my old 129 that split right down the center of tread between the lugs 20 yrs ago already. I put tire "Boots", a cord reinforced patch bonded inside the tire and patched the tubes and eventually the tire casings ripped beyond the boots again and I replaced them with some used BFG turfs I bought from Scott Madsen. But I know you want to put a new pair of 23-10.50 23 degree Firestones on that 169, I would too. I never really ever heard what the "Gum Dipped" amounted to on Firestone tires but it does seem to extend the tire life from cracking by a l-o-n-g time. That alone makes Firestone's worth the extra money to me.