Pitman arm puller size question

I'm disassembling my 1967 Dodge Dart 270 (225cid L6 with power steering) and I need to pull the pitman arm in order to get the steering box out. After fighting with the stupid thing with a pickle fork for nearly an hour, I decided I'd get my hands on a pitman arm puller and do it the right way. (FWIW, the front suspension is going to be rebuilt anyway, so damage isn't a huge concern of mine.) I asked a buddy who works at a shop if I could borrow a pitman arm puller and he said, "Sure. What size do you need?"

A few days ago, I had no idea that this tool even existed, much less came in different sizes. What size pitman arm puller do I need for my stock '67 Dart 270?