I love my spray rails. Well I did until they leaked, so I had to tear the teak ones off destroying them in the process and I am replacing with plastic.
I got them from here
http://www.barbourcorp.com/
Mine are 15.5ft long, starting a few inches back from the bow eye, and continuing along the outter chine to the water line. I wish I had installed them while I had the deck out so I could have thru bolted them.