I've used the Oceania Aviation of New Zealand's right seat slider kit and it is brilliant. It's a plate that bolts to the floor in place of the seat rails, that allows the seat to slide to the right. It has rails so that the seat can still move fore and aft as per normal. There is a longer right peddle and a collective extension, works on B3 as doesn't effect the throttle. Very easy to change between the normal position and the sling position and gives a Bell 206 quality view.