There were on the first load of Mk5's over here. They then realised they weren't required so switched to the solid ones. They have a removable back to them so in hot country's they could be removed to aid cooling.
I have a set that I've had on my car for ages as aesthetically i preference the look of them. Pretty rare to see a full set nowadays.
Mine.....
![](https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fdaz.co%2Fmedia%2Fmcaborn%2FMy_car%2F9b95a18a.jpg&hash=d783e964b9174ab056539723dfeecc17cb38fc9d)