What size hose for dv? and eibach question

cant remember what size hose i bought off ebay when i fitted my dv, bought it in red, but decided on a blue theme for the engine bay now (doh).

also anyone bought the eibach full anti roll bar kit? i know people rave about getting the rear arb done, but been told that mine only has a coupla thousand miles left so thought i mite as well do them both, they are about 260inc delivery from balance motorsport.