The AMS PowerProbe 9520-SK models include a 1.8m (72") probe stroke to allow use of 1.2m (4') tooling and a 90 ft-lb hammer with more options available. 
If a hollowstem auger capability is what you need, we have given you a choice of two auger drive head options that can be added to your skid steer model. Some carrier vehicle requirements are needed dependent on your choices.