I cannot find any identifying anything on these wheels. Nothing. I don't know who made them or when they date from. Came from a customer's '65 544 when she didn't want them anymore due to cost of installing new tires. I've run them with Michelin ZX and then XZX (165) with Michelin tubes, and had no problems. I don't know what tires are available that would work on the 122. Thinking no larger than 185, but will have to see what fitment is like with spacers.

I found these spacers. Look like they'll work?

Where the two halves mate, there is a cast channel for a very large "O" ring, (which was never present), so I guess they were intended to be run tubeless. Due to oxidation/corrosion that channel doesn't look like it would hold an "O" ring and air, so I'll continue using tubes.

The appeal was the look - they really work on a 444/544, but being able to repair a flat/change tires myself is also a plus.

No one responded about comparable sizes of the 4 pot calipers. Maybe somebody on the 1800 forum would know whether the 4 pots are slimmer.