My winter project is centered around seats. I have a few minor issues to take care of. Right now the driver's seat is out of my car. I'm swapping out the power seat switch and possibly going to tackle debugging a slowly leaking lumbar support. I have a second seat that I am using for reference and parts. While having the two side-by-side on the bench I noticed something. There are numbers marked on the bottom. In the picture below, my seat is on the left and has "3 8". My spare has "4 16". With my car being built on 3/10/1993 I think that the "3 8" could be a date. This might be widely known but I didn't know I'd find this.