Canonet QL17-GIII Light Seals
USCamera custom light seal kit fits the Canon New Canonet QL 17, QL 17-L, QL 17 GIII, QL 19 GIII, QL 19N, and the QL 28 rangefinder cameras. The kit includes 1 upper channel seal on the camera body, 2 latch plate seals on the back cover, 1 latch channel seal on the back cover, 1 upper and 1 lower seal on the back cover. All seals have adhesive already applied and to install you just peel off the backing and install.
USCamera light seal placement guide for this Canon film camera here.