66 Dart GT HT Whatsitgonnabe?

Manual steering and the diameter is 165 mm, 6.5". It lines up perfectly with the alternator that is using the stock mounting bracket as Don explained (to us - I had no idea).

Ok, i will check mine even tho it looks a bit different for these basic dimensions. If its the same then i will give you the pn for the 2 groove crank pulley i have.