Precision cut gasket using Flexoid British made gasket paper. I have designed this myself for perfect fitment above or below the "W" spacer block as fitted to the V6 Essex Engine. 1.5mm thick to allow for any slight tolerance issues. Note: Please ensure the base of your carburettor hasn't warped, this can happen on high mileage units. If you have this issue you can carefully flatten the base using a sheet of metal under some emery paper to sand it flat with water.