crank pin

[fartersbarters]

Hello, I am looking for some help finding the correct crank pin or complete big end assembly for my 1962 model 14 engine number 11591.
I have purchased one which has smaller diameters where it fits into the fly wheels though the bearing are correct for the con rod. My original crank pin has diameters of 0.940''. I understand the crank pin was beefed up over the years. If somebody could give me a part number for the bigger crank pin/assembly i would be very grateful. The one i bought is part number 900605 from the parts service, is 900606 the correct size one?
Thank you.
Steve