Which part is blocked? The front section and the cat are interchangeable with some of the 145/6/155 range IIRC - it depends on the cat to 1st exhaust box connection - some are a flanged joint, some are a sleeve joint.
If its that part you need it might widen your search a bit
Thanks RGWM
its going over to "rsr" (a performance tyre and exhaust centre) this morning for them to look at it. so will know more once they have looked. If its changed for 145/6/155 range what will that do to it performance ways?