We have a core product range, which is carefully selected to be easy to install, look good, be energy efficient for your home & last for years.
For the tracks this means an option of either a flanged track or a M system tracks.
We can discuss the difference between the tracks with you in more details once we have recieved your window measurements.
The cost is the same for either track type.
Other tracks are also available if you are after a particular track type please let us know.