So my block and heads are finally done at the machine shop. They removed all plugs on the motor. the screw in style ones arn't an issue, but No one seems to be able to get the small push in style ones or the plastic barbell shaped one for the rear of the block. I've been to carquest, napa, advanced, even the gm dealership. and the only ones any of them can find is the cyl head freeze plugs. Can someone please tell me where i can find these?????

 

The barbell plug is 12573460. The plug at the front of the block is just a 1/2" freeze plug, I believe.