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I do not think that gives an exact breakdown of his particular color options, just total production by color. As far as I know, GM did not keep track of the exact combo of options on the cars. I guess you could take a SWAG at it and come up with a number.
There were 1,374 2003 Torch Red convertibles (RPO7OU). And there were 303 2003 convertibles with red interior (RPO7OI) (but not necessarily on Torch Red vehicles). And there were 218 2003 convertibles with white tops (RPO16T) (but not necessarily on Torch Red vehicles)
So, we would have to take a guess, but I would be willing to say that it isn't very many. Maybe 100 that particular year?
Of course Torch Red convertibles with red interiors and a white top were available for other years too, so that reduces the "uniqueness".