Wow, great report on this! Seems to me the easiest and probably cheapest thing would be to get the part from the dealer. Even at their prices, how much could it cost? At the very least, I would call the dealer and ask. Secondly, visit them. Third, make your own.
And if you speak to them, maybe you could ask if the seat slides forward when you raise the seat release lever. Really curious about this, as the memory has failed. Again!
I love my car as much today as the day I bought it