How do you reach the back bolt when removing the water pump on a 1995 bonneville?

Trying to change out the water pump on a 1995 bonneville. Have all the bolts out except the back one. Can't figure out how to reach it.How do you reach the back bolt when removing the water pump on a 1995 bonneville?back one?... water pumps are somewhat flat so theres really only one side the bolts come out the back side would be inside the motor.... im guessing your talking about the one that is farther a way if you can get a wrench on it try from under the car maybe.... lay down on top of the motor or reach from the bottom