Wind load on a rectangle at 45 deg

I'm using AS1170.2 (Australia) for wind load design. This gives coefficient of drag for a square at 0° and 45° but for a rectangle it only gives loads at 0° and 90°. For a rectangle at 45° I think there will be along wind and cross wind load components but this is not covered in the code.
Does anyone have design values for a rectangle at 45°?
Here's what I have from AS1170.2. I've used a 2:1 rectangle in this example but actual ratio can vary.