BLES,
I have installed two Stereos in two different B series Toolcats. It is not difficult to do but you will need to purchase the install kit from the Dealer. If memory serves me the cost was approximately $200.00 which includes the wiring harness, speakers, and instructions for installation. You will need to pull the driver side headliner as well as loosen the 'liner' immediately behind the operators seat to reach the modular plug for the wiring harness. The only thing that may pose an issue is that I did weld a bracket on the interior ceiling for additional support (this had been done to my other TC that had an existing Stereo) between the Stereo and the rear of the unit.