it needs to be trimmed but doesnt look like that part has a ring to trim to
i checked my AZ for the drop in 160 stat which is part # 7203-160 and they dont keep it on the shelf and they are the eastern hub , they can order it and itaround 19.00 , its also a failsafe stat which Im not thrilled with the design
i run the stant superstat 45356 which has a groove to guide you when you trim it and can be had for around 7 bucks from advance auto, be aware the super stat seems to be made from stainless and is a little harder to trim than the standard stat