Spindle nut help please.

I feel stupid for asking but I really dont want to buy the wrong part and have to send I back. Again..
So I'm looking at replacing all the small hardware parts in the brakes and I figured I'd go ahead and replace the wheel bearings and put a new spindle nut kit on there too there only like 5 bucks. Here lies the problem. There are two of them listed which one is the right one they have the same thread but one says .37 and the other one dont thats the only difference i see. My car is a 75 dart large bolt disk brake car. Thanks

Screenshot_20190330-070605_Samsung Internet.jpg