Serpent have released a number of new parts for their S811 Cobra starting with these new rear uprights. Made from 7075 T6 aluminium they are very light and durable and offer a superb bearing fit and support. Grey anodised and laser engraved, they are available in left and right versions. Also new for the Cobra is this differential coupler in spring steel that enables the use of an extra 13x19x4mm bearing. The extra bearing on the coupler creates a more durable package.