Guys I learnt something and thanks to sifu ramsing for supplying the China Dolls...hahaha
When you get the e32 brake servo make sure that the back portion is detachable. This is so that you can use back the one from the e34 which is longer. If you get the one which is not detachable it will be too short and hence you can fit....
Hope this helps.....other than that it should be plug and play