What is the size of the Jam nut I need for the front control arm?

toolmanmike said

Spindle nut. 9 or 10" brakes or disc? (they are probably different)

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will check it out. I know they are 2 different sizes. Thats why the nut I took off a 69 barracuda wont fit this control arm threads. It is loose and slides over the threads.