some engine blocks accept the thermostat valve "WITHOUT THE RUBBER GASKIT"
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always check the Trans/axle code over the vehicle ID plate in engine bay, trunk or the front left or right pillar. use that code i.e U-440E , K313 etc etc to google the fluid type required for your vehicle.
Toyota AISIN auto Transmissions take up 4 different class of transmission fluids, always check which type suits your trans/axle code.