Is the colour code not on the chassis plate, or a plate attached to the bulkhead?
Ural and sidecar? My mate had a Ural Dnieper, looked like a WW2 German army BMW which I suppose is what they copied, huge beast, he had extensions on the exhausts which came up at almost 90deg so he could use it for fording and also keep his hands warm.
He wanted a sidecar just to put a machine gun on (not a real one).
Glad to hear the engine is running, let us know how that head works as its good to know of a reliable supplier. My mates Paj runs really well since swapping his and that was a year ago - he's a shepherd so his truck is used properly, carrying feed, sheep, tools, following stars etc.
Cheers
Pete