The only difference between triggers in Weatherby history was the German ones. The first ones had a slide type safety that was not on the bolt then the bolt shroud safety. Also the German triggers used a pin on the front of the housing. The jap made mark v,s did away with the pin and are now secured with a screw. I have had several American made mark v,s and they are the same as the jap. made ones. I would bet money that they will fit and function as long as they are not German made mark v,s. Call Weatherby if you like and i bet they will say the same thing.