Now it's even easier to install a Mojave heater with new installation kits from Flex-a-lite®! Flex-a-lite offers three variations of the installation kit. Part # 660 makes it possible to replace a failed factory heater core with a Mojave unit, Part # 661 is designed for a new installation (no heater previously installed), and Part # 662 is engineered specifically for UTVs with smaller diameter connectors and other hardware that will typically be needed.