im about to give up on this jeep

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ive just been supplied the wrong thermostat it looks similar to the old one but the rubber o ring is to big any way being to anxious to get it fixed i put it in and i ended up snapping one of the flanges which takes the bolt on the themostat housing when bolting it back on and has its made out of aliminium i might have problems welding it up any way i cut the rubber down so it fits why didnt i do that first is this part going to be easy to get or am i going to scale the w midlands scrap yards looking for one