Right, i haven't yet got a new vacuum reservoir but got the vacuum reservoir off (black ball at front of engine) and thought I'd post some useful info.
The
ibiza tdi has the same reservoir as other VAG cars such as A3 and Golf. It's part number is 054 129 808.
The part number is on the back of the ball which you can't see until it is removed from the car.
Thought I'd post this as I've been struggling to find this information.
One last thing. The ball is held on to its own bracket by a screw which can't be accessed whilst the ball is in the car.
The brack has to be removed which is simply held on by one bolt that can be removed with a size 8 Allen key. You ideally want a Socket-style Allen key that will fit on a socket set and this will make the bolt really easy to remove.
The only thing that complicates the removal of the bracket is a pope in front of the Allen bolt which has to be removed. This just needs the clip removing and a firm tug on the pipe to remove it. You now have free access to the bolt.
Hope this helps in future
Dan