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I've never replaced that washer on any of my Isuzus since the '88 Trooper. It's COPPER! A malleable metal that will squeeze and conform to seal until it's paper thin. Believe me, I just replaced one on my 1944 Caterpillar and I bet it was original! LOL! Just be sure it and the drain area are clean before re-assembly. Simple!
I just installed another magnetic drain plug that comes with a nylon gasket. The oil only had 500 miles on it. Had the new plug and gasket at the ready. Unscrewed the old plug while holding it against the pan with medium pressure. With other hand, pushed index finger under plug threads, then angle plug upwards while sliding index finger upwards to cover the hole. Grab new magnetic plug and gasket assembly and installed in reverse order. Lost about 1/2 oz. of oil total. A little messier perhaps but still not bad.
Now I have the additional protection of the magnet and never have to replace the copper washer again.