The Radium Engineering fuel line retaining kit supports up to 2 aftermarket fuel lines under the Nissan R35 GT-R. 

The retainers permit hoses to be ran in a channel different than the OEM fuel and brake lines. 

The 5 included retainers are made from 6061 aluminum and anodized to resist oxidation.

Notes:
1. This kit does not include aftermarket fuel lines. Maximum hose OD is 0.89" (22.6mm). NOTE: This is compatible with our 6AN, 8AN, and 10AN PTFE hose.
2. There is no way of determining exactly what size fuel lines can be used as there are many different types (rubber, braided, PTFE, aluminum, steel, etc).
3. Uses five OEM threaded holes and hardware with no drilling required.

Instruction PDF