Does your 41 have the metal frame enclosing the glass? Did the glass fit in the metal frame with setting tape? I changed the glass, the window channel and inner and outer bottom glass seals(whiskers) on my 4t6. Glass was purchased locally and weatherstripping at Jim Carters. If the glass fits with setting tape in metal frame glass size should be OK. If not try a different setting tape. If the glass doesn't fit into the frame without setting tape, do as Tiny said "take it back". I had to clamp the window, glass and frame, in the new weathersripping to get it to compress the weatherstripping a little bit. The whiskers on the bottom on both sides have to be squeezed very hard and maybe lifted a little to get to seal and to allow the glass to go up or down. There was some fiddling to get to work properly but they work well. Pictures start
here. Have fun and good luck
Dan
