Remove the bolts holding the thermostat to the frame and it will be easy to fit hoses C, D & E. Once you have those 3 hoses connected you can position and tighten the thermostat housing.

This pic is to show how the hose sits without the protective cover. These hoses are 30mm in diameter compared to the 26mm of the original part. The standard hose is a tight fit and the silicone hose is even tighter. To clear the frame and the carburettor the LiteTek hose has a slightly different profile.

Fit the original protective cover to the hose then once both ends of the hose are fitted you can vary the clearance between the hose and carburettor by rotating the hose. As you rotate away from the carb you will reduce the clearance to the frame (Detail A). The thermostat housing fitting for Hose C is very short so you cannot use a wide clamp (Detail B).