I have a couple engines/motors from Harbor Freight and I need some new aluminum crush washers for the drain plugs. One engine is the big 9500W Predator generator and the other is a 29 gallon oiled air compressor which has a tiny crush washer. Harbor Freight does not sell these washers as far as I can tell. Any idea where I can get some new spare ones? The Predator washer has an out side diameter of 12.25mm and inside is 6.05mm. And the Generator washer is outside diameter is 0.7895 inches with and inside diameter of 0.4745. Thanks for any help!