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Carnation

Nylon Washers

(115) 3/8" x 1-1/2" od x .060 thk, Fender Washer Nylon

Nylon Washer Drawing 

http://www.non-ferrousfastener.com/products.php?cat=205    $0.16 in 1000 quantity + sensible shipping

0.06" thick, which is about 1/16".