Because Enfield numbers follow no obvious form or pattern, its very difficult to find number lists. I quote Roy Bacon from his Royal Enfield: The Post-War Models:
'...the numbering sequence is known to be random to some degree and not to follow any pattern which would enable the information to be set out in an orderly fashion ... Fortunately the records do exist and are contained in some 37 ledgers, each 27" x 18" and 3" thick, all held by the Royal Enfield Owners Club dating officer. He can provide the date of dispatch, and often the destination, of any machine on receipt of the engine and frame number.'
So on the strength of that I would advise you to try the Enfield Owner's Club
Blue