Hi
Annexes are usually not just manufacturer-specific, but are often model and occasionally even year-specific too!
Some awnings can have an annex fitted at either end and some can only have them fitted at one end.
You can buy generic 'universal' annexes, but they don't have matching zips and I don't think you can expect them to be as weatherproof or durable as the awning manufacturers' branded ones.
Unfortunately, the branded ones are very expensive to buy new and it can be a bit of a nightmare trying to find the right one second-hand - particularly since demand for them is very high.
A cheap alternative, if you have the space, is to hang an inner-bedroom in the main awning.
Another solution would be to sell your Apache on and buy another second hand awning to fit your van, which already has an additional annex.
We bought our annex second hand, but from a dealer. We asked our caravan dealer to tell us when he received the right model annex in with a part-ex van. Within a week he had two to choose from and we examined them both and purchased the best condition one. This way, we an assurance that they were selling us the right one to fit, or we could return it.
I hope this helps.
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