If you don't buy one or two from Vintage, and you have someone shorten a stock cable for you (and he might as well do TWO, one for a spare) then he'll need the metric stub end that gets swaged onto the shortened cable. He certainly won't have the front pedal hook loop, so shorten it at the tranny end and use a metric stub to fit your wingnut - If he does rigging for European boats, especially Beneteau, then he'll have the stainless stub.
The end-to-end dimension from the top of the pedal loop to the end of the throw-out stud is 77 inches.
Another alternative to the metric big wing nut is drill the nut out and use whatever end stub you can find that fits the cable OD and then get a Nylock nut to fit the stub and run it up against the wing nut. Same thing accomplished, just MacGyvered a bit.