Shouldn't need to. With the C&L pipes we have, they came with a small piece of hose that goes on the TB (on a stock TB), then the coupler (hose) from the pipe goes over that and it then gets clamped together. But with a 70 or 75, you don't use the small piece of hose.
If you don't have this option, and have trouble stretching the coupler over the new TB, put it in some hot water to make it more pliable, then put a lil WD-40 on it and it should go on.