Can anyone see a problem with fitting a 11/93 onwards tow bar onto a 92 model imported 605?

Carasel have a tow bar 11/93 onwards which should fit in theory as I'd doubt they'd change anything structurally on the car during it's manufacture period.
Dad has been told this is not the case by a dealer in Coffs Harbour, & if he purchases the tow bar there are no refunds.

Any help appreciated.