Updated 8pc Thermostat Housing 's Bolts kit-form-Kit

- Violet Blue Silver Zinc Plated

-  ( Highest Level Salt Spray Test Rating Surface Treatment  )  

- The qty x 4pcs main housing's Sandwich-Bolts are JIS #7 mark-head double SEMS washers equipped and the correct Toyota 12mm hex-tool socket-wrench size-spec. 

- The qty x 2pcs Block-Face Bolts are JIS #8 mark-head double SEMS washers equipped and the correct Toyota 14mm hex-tool socket-wrench size-spec.

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- The qty x 2 very top upper housing Bolts for vacuum hose routing spring-tension clamps are the correct JIS Vessel #P3 Phillips / 12mm hex-tool socket-wrench size-spec.

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- we now have much stronger ( close to doubled ) metallurgy tensile strength factor , the additional wide-body flat SEMS washer spreading the Torque-Yield clamping-force evenly in a wider foot-print across the load-range board  , the  highest anti-corrosion surface treatment protection layer....... Then :  the outdated  weak , rust-prone , Sad-Single-Spring washer only currently still offered by Toyota same exact thermostat 's housing 's  application assembly hardware in every single possible way !