I’d call it a quarter light ,but like yourself wasn’t too sure if anyone would know what I was talking about lol. Seems to be about £65 to buy so will probably have to strip the door and take a look at what’s going on ,fed up of wasting money!
Starting to get bored of the problems of keeping a 23 year old daily driver on the road, starting to get rust on the floor around the rubber plugs where the carpet holds the water which runs behind the damaged door cards,such a shame as the mechanical side is great just let down by all the various water ingress these seem to suffer.