BB Fel Pro rear main seal?

I guess it has been a while since I bought a stock rear main seal for a RB. I picked up a Fel-Pro BS 40240. Instead of the normal seal pieces that go on the side of the seal cap. This kit comes with two pieces of pipe cleaner looking material, and a tube of silicone. The instructions say to fill the two side voids with silicone and then slide the two pipe cleaner looking material pieces one on each side after soaking them in water? anyone use this set up?