The 112 J-Series should be a standard long action. Measure the 2 action screws if they are 5.062" apart then its a Long action. I have a 112R J-Series ("R" is the repeater, "S" is the single shot variant) and it is a Long Action so I am betting yours is too.
If that's the case you just need a Right Hand Long Action Bolt Head in the appropriate size for your caliber. The older bolt bodies had a tab or nub inside the bolt body that a notch in the bolt head's stem fit into. The later bolts did away with the tab. If the bolt head you get does not have the slot, just take a dremmel and grind off the tab inside the bolt body and you're all set.
Best and probably cheapest way to find one is become a paid member here and put up a "Want to Buy" ad in the Member Only classifieds here. I am sure someone will sell you a used one or trade for yours.
And everyone remember selling or trading outside the classified section here is prohibited.
Just figured I'd save you Mods the trouble.
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