2003 Holden Frontera Roof Rails

G'day Everyone,
I'm just wondering if anyone knows or can offer any advice about attaching roof rails to my holden frontera. I've had a look at the roof and am a bit confused as to how to do it.
I noted there are rubber strips towards the aft of the roof so, as I understand it, these are removed and the rail supports slid into the channel. The fwd ones are a different story as the rubber strips don't extend that far forward :? .
Also, I'd be keen on some advice about what type of racks are good value (i.e. good for the money) as there seems to be alot brands out there. I'm a keen surfer and mountainbiker plus will be going on family holidays so I really want the verstility of being able to attach the lateral racks (on the rails) as well as sticking a roof cage on from time to time..

Thanks in advance,

Wade.