Polished 3/4" Billet Hood Vent Spacer Riser Kits Turbo/Engine/Motor Swap 6Mm Keeps your under the hood temps nice and cool. If you are looking for proof, check out Import Tuners writeup. These spacers are 3/4" (19mm) tall and include both washers and mounting screws. Need some extra space to accommodate any oversized engine swap? These will do just that! Add additional spacing to allow better venting for your super or turbo-charged vehicle.