Mini Starter not fitting

On my 1964 225, the original starter had been replaced by the guy I bought the car from. I think it was sourced from a 73 or 74 /6 Dart. This full size starter was not working when I got the car and needed to be replaced.

All I know is...I bought a used Chrysler/Denso starter at a swap meet for $35 after checking it with a battery while there. Cleaned it up and used it after rebuilding the engine. No problem at all with fit or electrical hookup. IIRC, the elec conn nuts are metric but were included. It worked fine for 2 summers then it became intermittent so I bought new contacts off the internet and it's good again.