Manifold Option Parts . Plug-in type, Non plug-in type Individual SUP spacer: VVFS5000-P-04-1 (Plug-in type) VVFS5000-P-04-2 (Non plug-in type) Individual EXH spacer: VVFS5000-R-04-1 (Plug-in type) VVFS5000-R-04-2 (Non plug-in type) SUP block plate: AXT628-12A EXH block plate: AXT512-14-1A Throttle valve spacer: VVFS5000-20A-1 (Plug-in type) VVFS5000-20A-2 (Non plug-in type) Interface regulator/A port regulation: ARBF5050-00-A-1 (Plug-in type) ARBF5050-00-A-2 (Non plug-in type) Interface regulator/B port regulation: ARBF5050-00-B-1 (Plug-in type) ARBF5050-00-B-2 (Non plug-in type) Double check spacer: VVFS5000-22A-1 (Plug-in type) VVFS5000-22A-2 (Non plug-in type) Interface regulator/P port regulation: ARBF5050-00-P-1 (Plug-in type) ARBF5050-00-P-2 (Non plug-in type) Individual SUP spacer Individual EXH spacer Double check spacer Interface regulator Interface regulator Interface regulator Block plate mounting position Throttle valve spacer ( ) : SUP block plate 1566 Series VFS5000