Speedometer cable for my Chrysler

Were do we get a speedometer cable for a 65 New Yorker? It has the 727 transmission. I called Speedway and that were asking me details of the fitting that goes into the back of the speedometer and I do not have that detail. Anyway, tried Imperial Motors at the telephone number in another C Body thread and it is some engineering firm. I know Lokar makes one that will fit the 727, but we cannot be sure if it will plug into the meter. Any help would be appreciated. Thank you.
Author: Boyd