I have fitted one to my TDI, they are thicker and more solid that the standard roll bar.
While it does physically fit, due to the different shape of the 4wd version, when fitted to the 2wd, its quite tight and seems like it will rub / clash as it passes over the subframe.
I can't exactly remember what it clashes with.
Mine has been on for a couple of years, but i wouldn't personally bother as go for a 2wd uprated H&R bar.
The R32 version is not as thick as the H&R ones, but thicker than the standard one.
Jas