Actually, every 65 speedo cable I personally have ever seen has the adaptor essentially molded onto the end of the cable itself. Never seen one with a removable cable housing. The 66 and up units I'm familiar with have all had the adaptor housing and cable as separate pieces. That unitized type cable construction is why us 65 guys have so much fun trying to find the correct gears.

OR... if he's suggesting to use the 66 cable to install a later, (post 65), trans into a 65 car - then I can readily believe that will work.

Mike