Thanks Richard,
Very helpful. I contacted Wolf and those bolts are only for hard chrome kingpins and not avaliable for the factory fitted version.
The threads are different for the different kingpins.
Do you or anyone else know if there is an equivalent type bolt for the standard factory kingpins?
Apologies I should have realised. Never thought to compare threads with old ones.
I doubt the shouldered version are made with OE imperial threads. MMC managed with the plain hex ones for 80 years so they were not going to change in a hurry.
An extra washer a snug fit to the bolt threads might be almost as good.