Roof rack for 08 Focus Estate Mk "2.5"

[jwm]

I'm looking for a roof rack for my Focus estate which I understand is known as a Mk 2.5 ie it's a Mk2 from after they did some changes to the Mk 2. 

It does NOT have roof rails - I've put a picture of the fitting where the bars will go below.

I found some likely candidates on eBay for £50 but the seller said they'd not fit mine, saying mine is a result of Ford's "Kinetic Design Strategy" and recommended thule ones which they don't sell - they sound a bit pricey to me - I won't use them much so don't want to spend too much and wonder if anyone can point me in the direction of some that'll fit and don't cost too much.

Thanks