[KevinW]

Sorry for the tardy response on this, others have probably answered already, I remember Gerry muttering something to me about original latches being hard to get hold off, but i cant remember if he makes these up or if they are OEM items - Im sure he'd be happy to talk to others. But for the record,

on my latches (which came from Gerry Hawkridge at Hawk Cars):

the base is 36.2mm diameter (approx 1.42 inches);
the external diameter of the handle shaft is 18.6mm (0.72 inches);
the distance between the two screw holes in the base is approx 27.2mm - this is only accurate to about a mm or so, as i measured this between the centre of the crosses on the cross-head screws.

Any other measurements, let me know, as I'm relaxing/working on the cobra project now before going back to salaried stress in a week or so.