Second gen shackle nuts and bolts

So I’ve lost a lock nut off on of the shackles, the outside spec is 19mm, but I can’t seem to find any info on the specs for a new lock nut. And info on thread pitch and sizing for ordering a new one would be great. Also I’m ordering them from a nut and bolt specialist so I need the specs not good brands to order from. Thanks I’m advance.

 

Grade 10.9 M14x1.5 and they are a flanged type nut.

https://www.mcmaster.com/95003A214

 

if its a stock one you can likely grab it from the dealer pretty quick. usually, 1-2 days if they don't have it. I may even have some left over but cant recall if they can be reused. I just cut mine off so happy to sent but prob not worth the cost.