Help I lost my nuts...lol

Buy a thread gage and check 'em yourself.

Front suspension? Great place to cheap out.
BTW....drive around all day trying to find 'em, or order McMaster and get exactly what you need, next day....
Yeah, that's a hard decision.
Go back and read posting #4.
The op already figured out the diameter, and thread size that's he's needing.
How many of us, that aren't machinists, toolmakers, have a thread gauge in their toolbox, so that's why he posted the question.

And i will state it again, the op can use whatever lock nuts that he can find, purchase.

Remember decades ago, when America actually had trade, high schools, that you could attend.
I went to Kaynor Tech School in Connecticut training to be a machinist - toolmaker, back in the day.
Upon graduation i worked in a factory for more than a year, and said this, (F it) factory work is not what i want the rest of my life.
Joined the Air Force and then maintained F-4 Phantoms, and T-37 Trainers, for 7 years of my enlistments.

So i know all about nuts, and bolts, tensile strength, grading of nuts and bolts, and the op isn't going to have a problem if he bought from Wall Mart, Grainger, McMaster Carr, or any another of internet vendors, new, or used.