BC Racing spring seats are manufactured of 6061-T6 aluminim. Each spring seat ring is sandblasted and then anodized to protect the ring from corrosion. This spring seat is the lower spring seat.
Most kits are fitted with 53mm spring seats, if you are not sure about the correct size, don't hesitate to contact us or you can also choose the option "Don't know correct size, I specify my car model on the order" and then just type your car model on the order message and we will then check automatically the correct spring seat for you.