System 1’s CNC machined billet aluminum clamps are ideal for securing any popular 2” or 2-1/4” diameter inline fuel filter to tube-chassis or “door car” application. They’re made of 6061-T6 aluminum. The D-clamps for 2” diameter filters have two ¼-20 holes spaced 2-5/8” apart and the larger 2-1/4” D-clamps have holes spaced 2-3/4” apart. The tubing mount clamps can be used with tubes from 1” O.D. to 1-1/2” O.D.