Fuel Tank Foam - E85 Compatible https://www.efihardware.com/products/2375/Fuel-Tank-Foam-E85-Compatible
THIS FUEL TANK FOAM IS E85 COMPATIBLE.
Dimensions: 14" x 6" x 4" ( 350mm x 150mm x 100mm )
Blocks can easily be cut and formed to suit your specific fuel tank internal design.
The fuel foam will expand upon contact with fuel.
To properly function, the fuel cell should have no more than 75% of the area filled with fuel foam.