I'm replacing the timing chain, water pump, hoses, belts, etc. Using Fel-Pro TCS 45284 gasket set, no instruction sheet included, but I've done a few, pretty self-explanatory, except... There is a felt(?) washer(?) 3.5" OD with a 2.125" hole in it, about 5/16" thick. I do not recall seeing anything like it when I disassembled it, nor do I recall anything similar on others I have done. Any thoughts greatly appreciated!