1965 Barracuda speedometer confusion

toolmanmike said
What is the difference in the end (s)? Just one end and if so which? Is yours smaller or does it attach differently? I lucked out and got one for my 66 (I know) from Napa. I should order a extra if they discontinue them. LOL

The transmission end goes inside the trans. and holds the speedo gear unlike the 66 and up that threads on a seperate speedo gear at the trans.