a couple of things, first off it was two years 61s had the same thing, if your willing to take the time they do pop up on the samba, but are in hot supply, they are funny little things i think i got one bare wheel but its rough so i never posted it, in all reality the "easiest" way to go is to use a 62-65 shaft and everything else, and as i found out if on the 60-61 shafts if the shaft is not in the center of the tube it sets your horn off, i laugh about the guy who gave me the finger when i found this out!!
good luck really if you have the time source out the bits, but if you have to go now then just put the later coloum in and youll be just fine!