I can't help you find skis. But that diagram of Federal skis brought back some memories of fun times in a Super Cub 20 years ago. A local and well-known CFI mentored me during my first year or so and lent me a set of Federal skis for three winters on the condition that I put new UHMW bottoms on, which I did. That led to 100 hours of ski flying around the Anchorage area, with a lot of learning along the way.

This is at Nancy Lake. Once I took my future wife to Shell Lake for lunch at the lodge. I landed on the groomed strip and taxied off only to look down and see the skis covered in water. Overflow! I threw the whip to that O-320 and luckily I had enough ooomph to get back out of it and into the air. Never did get that cheeseburger.

My mentor let me tag along one day during the Iditarod. We landed about a half dozen places in the valley before the racers got to Skwenta. My future wife was on that trip too. We'd land, watch the racers go by, and then move up a few miles into another spot to see them again. It was a gorgeous March day with blue skis, temps in the 20s, and light winds. Great day; one of the best days of flying I've ever had.
Seems like I had better adventures in those days! I wish you well in your search for skis. I'm sure it'll be worth it.