Hopefully i can help..
If this has been aftermarket fitted which most of these chrome style bars are - they mearly a decorative item only and is not intended for roll-over protection - of course they could offer some sort of protection as they are pretty sturdy built -
Robert , I have done a lot more research on the 'net and I think that I've found "a reason" not an answer !
It's product liability insurers that forbid manufacturers from describing or claiming that "rollover bars " offer protection .... in case someone sues for every penny 'cos they had an accident and the bars did not prevent injury !!!!
If you look on parts websites they stop advertising roll bars for 2005 onwards - that's when the mk.3 was introduced.