I'm swapping carbs to a Marvel Schebler MA-4 carb which has the drain fitting extending 1/2" below the intake flange. My airbox fit flush to my old carb so didn't have a clearance problem. My best solution is to make or aquire a 1/2" thick inlet flange (to go between the carb and airbox. Seems like this should be a common need but I'm not seeing one anywhere. Any input on sourcing one of these? Thanks!