Sounds like you have an "older" controlled round feed WSM with a staggered feed mag box.
You should be able to swap out the bolt head pretty easy. The standing ejector comes out very easy. It's held in place by the trigger group cross pin.
Hopefully someone else can give you specific info on firing pin size and etc. I purchased a complete bolt from Midway for my WSM action. All I gotta do is swap bolts or bolt heads and I can shoot anything with a .378, .473 or WSM case head.
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