For anyone looking to restore their cars to original health... these have just popped up:

http://www.ricambio.co.uk/69-fiat/64-coupe/674-handles-locks--catches

NOTE for anyone going for these...
- these original parts are quite matte black. They will NOT match your B-pillars since they've suffered years of rubbing / cleaning / weathering. Top tip: some very slight polishing (by hand, comparing them every few seconds) will make these new ones match your other parts)
- they come (at least mine came) with locks and spare keys (without chip of course).
- take the lock assembly (lock + surrounding parts) from your original set. Your car key has WORN and so have the moving parts in your locks (the little tabs). *

* if you ever go for new locks, you will most probably notice that the new lock will not be functional due to your key etc. being worn through years of use. New locks will simply not work unless you use your never-used blue or red key. Or if you wear off some of those tabs on the locks with eg. a dremel. Or... if you get your original key repaired by a specialist welder. Or a new key copied from your red key.

Almost £16 cheaper (each) here:-

Nearside

Offside