Our billet spark plug cover is only for k20/24 valve covers. Our billet covers are 5mm thick and made to t6 6061 billet aluminum.
Please look over the last 2 pictures how the final product looks. We decided to add extra mounting holes to prevent any vibration since this aren’t your normal thickest cover. Most spark plug covers you see in the market are 1-2mm thick.
spark plug covers come with all hardware.
4 Allen bolts