hi scott i had an issue with mine i didn't do the conversion but the motor was a 2.5na diesel it is now a 300 with r380 g/box, when i fitted a new exhaust thw whole system fitted except the front pipe it was about 2 inches too long i cut 2" out the straight bit that goes over the gearbox crossmember, i presume whoever did the coversion used the old engine mounts causing the engine to be 2" back.
you will find some of the exhaust mounts dont line up but the brackets on the chassis are there
i bought a full 300tdi exhaust and fitted it from the back fixing brackets as i went that means now if i have an issue i can fit a standard middle and rear (which are generally what rots) if the front pipe ever needs done its a standard pipe shorted by 2" in a staight section