Don't use the Freelander diff unless you have a bike engine.
The ratio is 3.2 to 1 giving you 120 mph in 3rd, 145 mph in 4th and 175 in 5th at 6,800 rpm.
With the aerodynamics of the Roadster being what they are (brick like) you would probably hit peak road speed in 3rd and have quite slow acceleration.
There are not a lot of light options for the diff but the 7" will be lighter than the 7 1/2" and both lighter than a fixed axle
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