My 2.5L 4L in my 95 YJ wrangler jeep wasn't that same manifold hardware that matched on your parts ID , the 03408B is for the inline 6 4.0 engine. Do you have the right parts?
Does not fit a 2000 wrangler. Has no ports for the O2 sensors. It only has one outlet for the exhaust where as two are needed to connect to the Y pipe. This will fit the exhaust ports but will not fit the exhaust system. My bad for not checking the exhaust before buying however it should not be listed as a direct fit for above 99, I believe.