Rick,
900X20 was the standard size tyre for all your Commers, Bedfords, Leylands etc from the 50's right up until the 90's for those vehicles in the 8 ton class.
A lot of these mid-size trucks still use them. I would be very surprised if you could not walk into any truck tyre sales place and get them off the shelf or at least have them brought in within 24 hours.
Lang
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