The 066 and 064 do not use the same brake handle, and within each model have a couple of different and incompatible handles.. the big divider is whether they are magnum-wrap or not.. get the wrong one (for the correct model) and you'll be unable to pull the brake handle back to unlatch the brake.
The older units also have a number of different part numbers that are a pain to track forwards.
The latest part numbers are 1122 790 9101 for the NON wrap, and - 9102 for the wrap. These are NOT compatible with the 064...