Left Hand Thread Stud

For sure a 65 would be 7/16-20. Mine are.

I see we have both styles of chrome lug nuts here... in post #1 it has a flat top (actually a shallow cone); in post #5 it has a longer truncated cone. I have some of both styles, though I am not sure how many of each are LH thread. There are also two hex sizes — some take 3/4 inch and some take 13/16. You probably want to check which size you need, as it's a pain having to carry two lug wrenches and it really confuses the tire shop (combined with the LH/RH issue).