I have been going thru my dads collection and culling any parts that I will never have a use for. I found a box with several nos clutch facings. They are US Asbestos, 9 X 6 1/4 X 1/8. The box says for 19'-21' Cleveland, 21'-23' Elcar, 20'-26' Overland. Are these good to use after setting on a shelf for probably 50 years ?? Ford