I had the same issue. I could not buy just the gear and had to buy the entire motor assembly. Luckily, someone on the forums gave me the phone number for Fiamma USA that manufactures the parts in Italy, rebadged them for Dometic who then sales them at twice the price!
Fiamma was the location in Florida that had the mass shooting of employees a few months back. I hope they are back in business. Here is the number: (407) 672-0091
Dave & Vicki Tedesco
2004 Itasca Meridian 36G
2005 Jeep Wrangler Unlimited
2008 Escape Hybrid
Brake Buddy
Falcon Tow Bar