Hung, I was curious about additional restrictions based on the child seat. C
We had the aftermarket version in Putt Putt. Seat Belt was the full real deal - no shoulder harness and none available. As long as you didn't get out of weight/CG it's all legit.
Now, go do the W&B and price the seat (installation was a breeze).
The price was bad enough - the W&B ended up with us getting the Cherokee.
And Catherine - I am not at all certain what if any restrictions on operating Wilbur in intentional spins would be. I looked in the paperwork I had and didn't see anything specific.
Edit: Duh, I see the questions were answered. That'll teach me to post before I finish reading. We had the Aviation Fabricators eat and there is an IMPORTANT point to make - the STC is valid for the serial number of the aircraft it is installed in, and transferring it required sending the seat to Aviation Fabricators for "inspection" and that was priced at $600. Simple math - you buy it for your aircraft and that's it.