The FAL fan is part of my list if i decided to use a aluminium radiator. Locally you have the Billion fan which you can purchase to fit your factory sized radiator. The FAL fan has better features and they have variety of models available to suit your requirement.
Redza managed to do the fan comparison and it was obvious after the installation he had more space now. I believe Redza's water temp should be lower now which definitely helps engine efficiency.
No doubt you can find used factory fans from other car brands, but it doest weigh and blows like FAL fans.
The Flexite moulded windows are also my favourite.