You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
Just select "Other" then "Something Else" and there, write: Over The Counter (OTC) Part Request: Model S Key Fob or Key Fob for my Model S.
If you find it more convenient, schedule the appointment with a Mobile Service Technician and pay for the fob on the app once your Service Center confirms the appointment and sends you the quote .
Service request through the app as mentioned above. Mobil service can/will deliver and program it. At least this is how it went a few weeks back for a buddy of mine in rural Illinois.