I have Bosal exhausts catalogues and in the 04/05 book it lists following part numbers for the 3 boxes on the 4 cylinder car from front to rear as follows.
210-737 , 210-713 , 210-718.
The parts are not listed at all in the 06/07 book but a Bosal dealer may still be able to get them if Bosal have them in stock.
I have used Chester Exhaust Supplies for odd ball parts I cannot get from bosal and there service and price have been good, the seem to be able to make parts themselves if they need to.
Regards
Robert