T-Works X4 roll centre & gear adaptor spacers
From T-Works for the Xray X4 is this range of roll centre spacers and gear adaptor spacer. The roll centre spacers simply slide between the bulkheads and the chassis for quick adjustment. Available for both the front and rear of the car, they come in 1mm and 0.5mm variants. The gear adaptor spacer is 1mm thick and comes supplied with three low profile 3x5mm screws.
Source: T-Works [rc-tworks.com]