Its a whole beam martin

Fitted to the mk5/5a and very early mk6 RS2000's

I think some of the 130bhp XR models had the rear disc beam too?

There was a company that did a conversion for a rear drum beam, it used focus parts. Pumaspeed or pumabuild IIRC? This allowed you to keep the rear abs on later mk6 models that the mk5's lacked.