Just spotted this.   http://www.ebay.co.uk/itm/VAUXHALL-COMBO-CORSA-MK1-MK-I-1-5-1-7-D-TD-1993-1994-2001-DIESEL-ALTERNATOR-/182466400127?hash=item2a7bd84f7f:g:gE4AAOSwdGFYsD0X It is what Alan Wadley would fit to hotted up cars so the servo worked without affecting the PI MU vacuum line. A vacuum tank can also be used from Jag Mk2   Peter W