Larry: the M15s use a different window 'system' than the oldest M17s, such as the '78 mentioned below. when Jerry built the new M17 deck mold the M15s and M17s used the same 'system'. to bed the window use marine grade clear silicone. this is the ONLY location you should use silicone on your boat. :: Dave Scobie :: former M15 owner - www.freewebs.com/m15-named-scred :: M17 #375 SWEET PEA - www.m17-375.webs.com ________________________________ From: "Hughston, Larry@DGS" <Larry.Hughston@dgs.ca.gov> Sent: Thursday, August 15, 2013 9:08 AM Bonnie, on your replacement windows, what type of sealant did you use and where did you get it? ----Larry Hughston in Sacramento, with "Old 189" M-15 by Jerry M. -----Original Message----- From: On Behalf Of Louis Remmers Sent: Monday, March 05, 2012 6:36 PM I replaced the windows on my 78 Montgomery using plexiglass. It is a challenge but you can remove the present window frames and insert the new glass calk and rebed the windows. A challenging but fun job. --- On Mon, 3/5/12, Bonnie Kostka <bonniekostka@sbcglobal.net> wrote: A while back someone mentioned where to buy replacement widows, Did anyone buy them & where did they buy them? Bonnie M15