Hello Greg,
If you contact marine supply companies such as:
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Hamilton Marine
Rt. 1
Searsport, ME 04974
Phone:
800-639-2715
http://www.hamiltonmarine.com/
---
Jamestown Distributors
17 Peckham Drive
Bristol, RI 02809
Phone:
800-497-0010
401-253-3840
http://www.jamestowndistributors.com/
---
and search or ask for boat hand rails, they might offer what you are looking for or be able to refer you to some other company that does.
Regards and Hope this helps,
Culver Adams
Minneapolis, MN
1961 GMC K1500
(plus some very small boats: this is the land of 10,000 lakes, after all--mostly frozen as I write, however) :=)