I used to have a complete set, locks and all with keys. I may still have 'em...lemme check tomorrow or sunday.
Like Mavaholic said, the 67-68 handles fit. You can pick up a complete set from the Mustang vendors for about $20. They're repops but they are new and look great.
Or you could get a set from autokrafter in thier maverick catalog...........I think the handles in that catalog fit 67-68 mustangs also
I picked up door handles,antenna window cranks,hood bumpers, and other things this past fall at a mustang show and swapmeet. best to take the parts you are looking for to compare them. Robert