You can't buy a bimini without EXACT dimensions.

B.S. Overton's has them and they use Sunbrella material if you get the
better Quality material.
Measure from the center to center of your gunnel and the height you want and
go from there.
If the boat is not very fast you can use aluminium with no probelm.
I recommend having the back supported with Tubing instead of straps. You can
mount your running/ anchor lite on the cross brace.
A slider is a good idea also for that finale adjustment.
And finally you can buy a boot to cover the canvas when the bimini is stored
in the back or down position.
WORKED FOR ME!

IMHO Larry Hill