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3.5 in kingpin. Main shaft specs call for 4.5in diameter but its an interference fit at that so 4.475 works. I have a extra 2in pin for anyone who is looking for one.

Worked great. Installed a bigger top catch though rather than using weld around the outside edge or the washer

Total length of the pin needs to be 9-9/16" longer than the spec sheets provided. Attached are specs for the 3.5in pin from Castle Bravo.

Kingpins are made of either 4320 or 8620 so hard enough I am having a flip pin made. 4.5in diameter 8620 came in 2ft stock lengths. Going to have it as a 3.5in pin on one side and a 2in on the other with a raised weld in the middle as the hole catch for the pin. So you can simply use 1...

Will bump this with some information. Replacement kingpins for the 870a1 are as follows For 3.5in and 2in Overall length : 8.5" Barrel thickness 4.5 For the Load King 870 3.5in kingpin Load king part# MP5-1639-1. 2.5in kingpin Load King part # MP5-1638 Spec diagram attached of both