Hi all.... replacing my brake cylinders on the rear of my 12/70 - 40 series. I'd like to replace all of the washers. I believe they are copper crush washers but I don't have them apart yet. Toyota is talking almost 3 weeks to get as supply is limited and spread all over the country. Is there an alternative part readily available as a quality replacement? The original Toyota part number is 90430-11100. Thanks!