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

Here is the nut on it’s own, available at my local auto parts store.

Note the Dorman brand and part number.

I would just go into your auto parts store and let them know what you are looking for, to insure you get the right part.

For that matter just post to want ad surely someone will respond and make one available to you.

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Will do thank you