I want to replace the injection pump on my truck. According to the shop manual, the drive gear on the front of the pump needs to be removed before the pump can be taken off the engine. Apparently there are two threaded hols in the drive gear that accept bolts from the gear puller. Not an unusual arrangement, but before I get halfway through the procedure and them flounder, I want to be sure I have the proper bolts. Can anyone tell me what size and bolts I need?