The Deda Elementi Alanera Alamount mount will allow you to attach your Garmin 500 and 800 series computer.
 
NOTICE:
Always use a strap to secure the computer to the handlebar, this keeps your device in position in the event of a fall or rough paths. Max load: 350g (i.e. 150g computer + 200g light).

TECH SPECS:

• Material: Nylon glass fibre reinforced  
• Finish: Black