These crimp clamps are the OE style stainless with the band going one and one half times around so there is no pinched hose and little chance of fuel leakage. Why trust your Vanagon or your life to anything less.
Available in the following sizes.
8.8-10.5mm fits most 3.5mm ID single layer braided hose
9.6-11.3mm fits most 5mm ID single layer braided hose
10.8-13.3mm fits most 7mm ID single layer braided hose
11.5-14mm fits 7mm ID single layer hose
12-14.5 fits 7mm ID double layer hose
13.2-15.7mm fits 7.5mm-8mm ID double layer hose