This is a complete kit to move your M30 coolant divider slightly forward so that side draft carburetors will comfortably fit next to it.  Everything needed is included:  the divider, two gaskets, three Allen head bolts, and three longer cylinder head studs with their nuts and washers.  The nuts are the correct 12mm wrench version that came on the vintage BMWs.
This spacer works with all side draft carburetors including the Spanish Webers which require slightly more space than the Italian versions.