first things first.caps lock off. sorry. my bay is 68 so is front hinged(westy).i have fitted 3 canvases and all have leake.the worst area is at bottom of rear window. all the suppliers have refunded me in full after i emailed pics of the problem to them. the last 2 canvases cost£300 so are not the cheap china ones. the last canvas i proofed but to no avail . it still leaked. all 3 have been a great fit