Sorry for the delay in replying.
It should fit however i would probably prefer to see some photos of the existing outlet to be sure
The parts you see on the page are all the parts that are available, unfortunately the rail is now obsolete.
If you wanted to stick with Aqualisa you could go for one of the more modern sets, or if you wanted look at some of the other kits, which would be cheaper than Aqualisa http://www.shower-warehouse.com/shower-accessories/rail-kits
I am afraid that this is no longer available and unfortunately I do not know of another source.