you have ecocity what flange and from were did you acquire it
is it new or pre-owned ?
below is a all OEM parts 1972 FJ40 complete system images for technical reference
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The stand alone slip flange is a unique part you must use , in addition to the front pipe having a profile at the manifold side too
i HAVE never seen offered up in a aftermarket Varity in any way .?
@65swb45 has the NOS set up going on , you should seriously consider this ....
matt..