These carburetor spacers are CNC machined from solid billet aluminum and anodized. The four-hole spacers feature pockets on one side to reduce weight and give an additional tuning option by placing the open pockets down for more plenum volume, or up for less volume.  The open Dominator spacers have a thin plate built in to protect the engine from damage in case the linkage comes loose, so no separate safety plate and extra gasket needed.

Dominator Open Carburetor Spacers