strut rod nuts

Hi,

Where could I find correct strut rod nuts for 69 Valiant.

I have searched form Rockauto and Summit but they don't sell them or will any correct size nut to ?

An example of the nuts used:
http://www.forabodiesonly.com/mopar/attachment.php?attachmentid=1714728490&stc=1&d=1402328852

Chris.