Installed the snaps on the bottom seat cushions. I started with the passenger side first. I didn't realize it at first, but my passenger side cushion does not have snaps on the rear flap like the pilot side. nyways, I wanted a more secure fit than I saw on the demonstrator, so I drilled my holes farther back than the pre-drilled holes to reduce the slippage. To help protect the fabric, I added some wire loom over the front of the seat pan. Riveted the snap halves into place.
Repeated for the pilot side except I also added rear snaps since they were provided on that cushion flap. If I find I need it, I can add some velcro to the passenger side rear flap and seat pan later, but for now the pilot side is my prime concern.
Reinstalled the seats and it feels much better getting in without the seat slipping. Such a small thing makes a world of difference.