If have RZ model you can go to 42 inch link show same mounting a Dealer could help if big Dealer one they get ZTR and shipment different decks.

Here is a link that might be useful: Deck for RZ

Thanks for the reply, However I got this message straight from Husqvarna:

Jimmy,

Thank you for contacting Husqvarna.

Unfortunately it is not possible to change deck sizes on any our four zero turn or tractor models. The deck assembly is part of themachine and can not be swapped out with a different sized deck.