I think you are looking at the hammer nose (firing pin) intended for center-fire hammers and associated rivet, not .22 rimfire. In rimfire revolvers the firing pin is frame mounted (see exploded view section in upper/right hand corner of drawing). They list the firing pin spring, but not the firing pin itself.
To replace that firing pin (old style) the bushing has to be removed, which means the small pin that holds it has to be removed. So order a small cup end punch also or you risk battering the frame.
My copy of the GPC catalog lists the firing pin, spring, bushing and bushing pin.
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