Hi, I was just reinstalling the waterpump on my '90 E34 M30. I was torquing everything down to 22NM (16ftlbs) as stated in the Bentley manual. I was at about 18NM when the bolt broke off in the motor.

What type of bolt extractor, Brand, size, name, ect... should I use to get it out?

Any other help would be appreciated
Tia,
Eric