Yes if it is the spring loaded flap I have replaced one on my old van.If I remember towsure or my local dealer supplied it.It is held in position by two sliding nylon or plastic pins.I only purchased the flap,not the whole assembly.
Thanks Fozzie that's what I want and the fitting as just as suggested. Will try a dealer when next passing one but wondered f anyone had brought one through the internet.
Fisherman