Tony, not much help here but you're probably better-off without the plastic shroud. They always broke pretty much instantly, as soon as the brakes were tightened up, and then just frayed around until you could be bothered to remove the brakes and re-install minus them. That was my experience with them anyway...
(that and a knackered spring which I need to replace one day if I'm ever gonna get 'em working and fitted again...!).