If you're still searching.

There's a set for 60-62 on evilbay at the moment:

I think these could/should fit a 64 as well, or at least be a nice proxy.

rear:
https://www.ebay.com/itm/1960-1962-F...0AAOSwxsNfnkC6

front
https://www.ebay.com/itm/1960-1962-F...cAAOSwV~lfk~qT

Greetz, Rinke