Yes, but I don't think anybody makes them for retail (probably wrong, but have not found them). I found an article on-line addressing the spacer, but the guy built his own out of poly... Best bet is to go to a machine shop and have them cut you one. Make sure the surfaces are true and flat, or air WILL leak. Best used w/ a bigbore... You can also radius the port hole to allow air to flow better, you probably already know this though... or you wouldn't be asking. Good Luck.