The passenger side felt was easy because it just uses those plastic 1/4-turn "pinwheel" fasteners into rectangular slots. Unfortunately I seem to have lost the lower 1/4-turn fastener that blends into the back plastic kick panel on the side of the heater. Does anyone out there know if you can buy these somewhere?

As for figuring it out on the drivers side - I have put the felt (old original but still crisp enough) up there without using any of the clips or screws. I can see now that the edge of the felt comes to the edge of the metal framework that the knee bolster attaches to. The edge of that metal must be where the clips go. The clips are metal, so it sounds like they are different from what is used on the 940. I think it is going to work by sliding the barbed part over the metal and the mouth of the rectangular shape over the edge of the felt.

I am still mystified by where the two black metal screws go.

As far as I could tell, I was the first person to take this apart in 2017 so it was an example of a clean install. Too bad I didn't take detailed notes or pictures. It seemed like it would be obvious at the time, but I didn't anticipate how life would happen and the 5 year gap that resulted.