All I can say on the positive side about the TSSC tunnel (which came in a Moss box), is that it is better than the piece of corruption that I removed. However, there is NO way it is suitable for a Mark 1 Spitfire 4 without butchery. Which butchery has been, actually, rather satisfying.
And oh how I wish I had seen this thread before buying the fitting kit! What a waste, at least when trying to conform to the existing screw holes.
The experts say that no two classic cars are the same. How right they are!