What’s the problem with the existing box?
As I understand things the angle of wiper throw is determined by the size of the wiper box wheel
If only the wheel is a problem might it not be possible to fit a the wheel from the new box you have?
Alternatively the outer tubing is relatively standard and easily available and could be made up to a longer length, flared at each end, but you’d need to be able to get to the other box to fit it. You would only need to do that piece of outer cable.
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