What are they called?
Token Pyrotec ;)
If you google carbon computer mount you'll find loads.
I have one Token and one of these: http://www.ebay.co.uk/itm/ACOR-Bicycle-Bike-Handlebar-Mount-Carbon-Computer-Bar-/260922621097?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item3cc0333ca9
They're good because you can cable tie any regular bar/stem mount to it and then you can adjust the angle of the mount on the bars and the mount on the mount (iyswim) so you have complete adjustability of the angle and height of the computer.
@Sanddancer started
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Token Pyrotec ;)
If you google carbon computer mount you'll find loads.
I have one Token and one of these: http://www.ebay.co.uk/itm/ACOR-Bicycle-Bike-Handlebar-Mount-Carbon-Computer-Bar-/260922621097?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item3cc0333ca9
They're good because you can cable tie any regular bar/stem mount to it and then you can adjust the angle of the mount on the bars and the mount on the mount (iyswim) so you have complete adjustability of the angle and height of the computer.