Trike 1999 - 2008 Installation Guides Keep Your Harley Running Cool with UltraCool The New Trike Oil Cooler Installation Guide 2.0 Version with Relay Harness as of March 1, 2018 Download The NEW Trike ’99 – ’08 Cooler Install Guide as of October 1st 2016 Download Trike ’99 – ’08 Cooler Installation Guide (Prior to October 1st 2016)