Where is best place to purchase Hydro-gear replacement parts

I have a Husqvarna cz4817 zero turn mower once it got hot the transaxles wouldn't pull so i tore both of them down and now is needing to purchase parts for the hydro-gear transmissions , I went to the Hydro-Gear parts.com site and almost purchased parts, but at check out I noticed the seller was small engines pro.com which has very bad revues ,so i cancelled the complete order before paying. any help very mush appreciated.