Ya, I’m too lazy to do that, Home depot much closer. 
Guys, there is a reason behind using fiber washer. If you can find same thickness fiber of course you can do it. Out side Diameter is not important. I don’t want to go over pressure and flex statics here. I tried many different way to do this, all failed after first job. Trust me on that. I’ll give you specs one more time, in case you need it.
