#47 Masterlock key blanks needed

Hello All: I'll preface my query by stating that I an NOT A COLLECTOR OF MASTERLOCK'S... but I do have a liking for 1940's & 1950's bicycle padlocks.. I recently picked up a #47 bike lock (long shackle) & discovered that the groove in the key blank that I am searching for is not the same as a short shackle #47.. The blank that I need has the groove on the left side .......like a #48.. can any one help me . I would like to find 2 or 3 so I can key this lock...............Donnie