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Castle nut thread size for 1971

71Beeper

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Guys,

What thread size is used on the castle nuts that hold the center link to the rest of the assembly?
I took mine off to drop the center link to get my oil pan off.
The PO beat these and they look like crap so I'd like to replace them.

I'd like to get some stainless ones from McMaster Carr but need a thread size to start - or are original ones available?
 
Part # 9425132 is a 1/2-20 tri-slot castle nut.
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