There is another builder, Seth Laam (https://www.laamseats.com/), who also may be able to help you. Far and away one of the best seat builders in America. If you want to chat with him, call don't email. You have to set up a prearranged ship-to date and he'll tell you how long it will take to get back to you.Hello all - this is the closest thread or info I've found on that rider lumbar support for the 2022 C400gt - I think I'm going to pull the trigger and do it - I just spoke with Andy and got the details - it requires me to send my entire seat to them - 3 week process to get it to come back if they can do it - I'll post pics here if I do.....