It will fit either side of any awning or porch which has a zip out side panel.
It is stone coloured fabric, it has one steel pole and guy lines, made from 150D fabric with 3000hh.
The annex comes with a 2 person inner tent with waterproof base. It fits to the roof poles of your awning and makes a good waterproof fit, the section which makes the join folds out to cover the edges where the side section has been zipped out. Careful pegging will ensure a good fit.
This annex is the only real alternative if you cannot get the one manufactured to fit your awning.