The 7th and 8th digits of the product ID code indicate your version number (e.g., "05" = Version 5). It is simultaneously the drive wheel — receiving all of the motor's power via the #25 chain — and the steering pivot, turning left and right in response to the drift bar.
The Genuine Front Wheel Complete Assembly for Razor Crazy Cart & Crazy Cart DLX is ideal for restoring old Razor RZR products.