Per Jamie Hansen, Philbrooks Boatyard, Ltd., Faucher.ca has stainless steel window channel (621-4471) which fits an LNVT's 10mm glass. It costs $47/8' + shipping from Canada. He describes the installation process as follows:
The windows are made with two stainless steel frames that are inset into an outer frame that is attached to the cabin side. The inner frames are held in with small flat head machine screws under the gasket material. After the old gasket has been cut out and screws removed the frames can be pulled out using small pry bars or tapped with a wood block and hammer. Be careful not to bend or kink the frames during the removal step. Be sure to clean the inside of the metal frames well to prepare for the new gasket material.
To bend the new gasket into the frames can be hard so we have come up with a helpful method to obtain a good fit. Using the frames as a template, trace the inside shape onto a piece of ¾” plywood or MDF. The cut out is a good jig to bend the gasket around and give you the right size and shape to fit the frames. Slots are cut into the gasket before being installed to create the drain holes. The track can be glued back into the frames with silicon as well as the frames into the openings on the boat. Tape can be used to hold the gasket in place while the silicone dries over night. Be sure that the new screws attaching the frames are not in the way of the operation of the sliding pane of glass.