Mini Starters for Dodge Darts

Hi I have a 1968 Dodge Dart GT and am putting in a 360 Magnum with a Keisler 4 speed automatic overdrive transmission with TTI Headers. I am looking for the correct mini starter to fit this set up. I had one from Chrysler Part number 53005984AB however it was too big by 1/4 to 1/2 inch. does anyone know of a smaller starter that will fit this application? I've been asking around and can't seem to get the right one.