Well both of the sets arrived within a few days of each other. The link that I put up (post 4) arrived as per the listing description, but the second one was of a similar but different sprayer to that was shown in the E-Bay advert, it had two nozzles (side by side) instead of the one. Which I assume would just shoot out 2 individual straight jets of water instead of a fan shaped spray unit which I wanted. The nozzles are slightly angled to each other, probably to give a high and low stream on to the windscreen. The cheapest 2 nozzle units on E-Bay are about $2 delivered for two pieces.
So I got my money back on that one from Paypal and got to keep it as well.
The original Jeep sprayer does have two jets, one above the other, one is a small round hole and the one below is a rectangular fan shaped nozzle. I suppose the best spray pattern.
Having said that the one I put on doesn't seem to spray out as much water, but it still does about 85-90% as the original and still does the job, I still have to test it at driving speeds but it should work OK, if not I can always use the twin nozzle units I received.
Overall I am happy, certainly much cheaper than the exorbitant prices from the Jeep dealerships.