These are a universal brake master cylinder reservoir that is compatible with pretty much any bike. They are a nice tidy little coloured reservoir available in the colours shown to match any other coloured items you have on the bike.
The mount on the bottom can rotate to allow for variable mounting options and if you want to relocate even further away from the lever you can just add a longer section of hose.
Comes with everything shown. They are about 39mm wide and 45mm high.