MB has the clamps. I bought some last summer along with new OE intake hose. They are made in Germany for MB by GEMI and are ss. Part number stamped on clamps along with MB Star and ring is N15003. They are as the originals nut and bolt. If you need further info about these clamps, I will try to find my invoice for total parts number.
Bob
Robert Hyatt
Williamsburg, VA.
1970 280SL, Red on Silver,4-speed, Euro spec; 1999 C230 Kompresser Sport, Black on Black; 1990 Miata, Black on Red, 5 Speed