Who would ever want to crush a beautiful car like that ?
Original 2-Speeds are getting hard to find, but your best bet would be to find a good used core and send it out to be rebuilt. If no one jumps in with one available, you could try to call some Wiper Motor rebuliders to see what they have in stock.
By the way, they are the same '59 to '62.
Keep us posted on it.
-Parting Out over 75 '58 to '73 Full Size Chevy Cars-
-National Impala Association
-Vintage Chevrolet Club of America