I don't think modding just the door will work because new door comes with a new plastic cup. So you have to remove your original cup and mod the outside so that the new plastic cup fits. The new door really isn't the problem, it's the fitment of that cup into the Cougar. You could try to figure something out, I could be wrong. But I really don't think there is anyway to get the new cup to fit in the Cougar without cutting off those tabs.