Seachoice and Marpac sell the glass ones. Not sure how they hold up.
http://www.ebay.com/itm/PAIR-2-FIBER...d47fb9&vxp=mtr
A friend may have one. Will know in the morn.
Found out they were made by Perko. They may have one just don`t have a pn. They sent me a pdf, but for the 15 ft. version.