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jn;
Just measure the threaded stud OD...I don't have one in my hand right now, but I know they're not UNF (and pretty sure they're not 13mm Metric)...if yours are castelated nuts (requiring cotter pins to secure) you could certainly replace them with nylock type, but it scares me a bit when you say that the nuts are bunged up enough, I hope that the associated threaded studs of the mounts are not equally bunged up...you might want to chase the threads to clean them up...
use Anti-seize to reassemble!
Cheers
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