There is a ongoing tread on THT named "Center Console Front Shade" and what got my attention is the Blackstick shade.
https://www.theblackstick.com/
One wrote that they make it on measure what would adapt perfectly to your boat, however i fear that they are rather on the expensive side.
However, asking a quote cost nothing.
There are some other solutions so you may read there even if no-one is telling the length of the poles as your question was.
Chris