Don't know why this is such an issue. I have never, in 55 years of riding motorcycles, replaced a "crush" washer - which don't really crush at all. In the old days they were actually hollow and would "crush" providing enough seal and tightness.
Now? They don't "crush." I put a tiny bit of RTV blue on the threads near the head and snug tighten. NEVER had a problem or leak! Hundreds of thousands of miles!
I don't even replace them on my cars (Toyota & Hondas) even when they come free with the filter.
"The difference between death and taxes is that death doesn't change every time congress meets." - Will Rogers