Hi Kevin, a bit of a hike for you, but Railmakers, Everett, WA has done work for me and they do top notch work building/repairing SS rails. Give them the dimensions or a pattern of what you need. Just a thought if you have no one in your area or source to your inquiry.
Railmakers did a hit and run repair on our aft starboard pushpit rail a few years ago. They cut out the damaged piece and welded in a new section plus aligned other sections. Repair looks brand new. Is your section completely gone or does it need repair? If you still have the original that needs repair, might be worth doing that rather than replacing.
http://www.railmakersnw.com/index_files/RailmakersNWPage7Contact.htm