I (with a lot of help) just installed Recaro seats from a 1LE in my 2017 1SS. The only way to make this work that I know of is to swap the harness from the stock 1SS seat to the Recaro. If you need a video showing how to remove and install the seats, Lethal Garage made one. Here is the link:
I thought I would post a few pics showing the harness swap, as they might help someone trying the swap. I wish I would have had access to pics like these when I was attempting the install.
The wiring harness from the Recaro seat:
Recaro seat opened up:
Recaro seat opened up pic 2:
Stock 1SS seat opened up:
Stock 1SS wiring harness:
Comparison of the Recaro seat to the stock seat:
Finished product:
I am EXTREMELY happy with how this turned out. These seats made a HUGE difference visually and in terms of performance. If anyone has any questions, I'll do my best to answer.