I picked up a Tanaka TIA 305 post hole digger power head. With a little tlc it is back running fine. I am looking to put an auger on it. Are augers brand specific or do a few brands match each other in shaft size and bolt hole line up? I don't have a pic of the shaft. It is just a straight shaft 1 in or maybe a little more. I believe it has 2 holes in the shaft for pins or bolts to mount the auger bit. id be more interested in a used auger but if I have to buy new I could go that route. 6in or possibly 8 in.