Genuine Toyota 1JZ 2JZ GTE Valve Cover Seal Washer Set of 16 - 90210-07001
These seal washers eventually get dry and hard, and prevent your valve covers from clamping down and sealing properly. They should be replaced at the same time as the valve cover seals.
This is a set of 16 for 1JZ or 2JZ GTE application
1JZ 2JZ 7M 7MGTE valve cover seal washer
These washers are exactly what I needed to replace my old dried out, cracking washers that have presumably been on the car from birth.