Make a buck and form your own with a heat gun. There are several threads on this.You could try a larger canopy with less of a "slope" and trim it down.
Carve the shape you want. Seal and finish it. Then send it to me at RSM Distribution, 21899 Heliotrope Lane, Wildomar, CA 92595. I will be happy to pull one or two for you on my vacuum former machine.Eric Rule