t-bar makes one that's ready to go, or....
you can save the arm from the old reel if it is the newer two position type, or order up a new two position 6/0 power handle. grind out the rivet, save the arm and toss the old grip and spindle. now get a new grip and spindle from the penn international, drill out a slightly larger hole to accomodate the spindle, and bolt on your new international grip and spindle onto the old 6/0 arm.
i've adapted an offset grip to this arm as well. the arms that you see, left to right, are the tld 20/30 II, the tld 20/25 single speed, the penn international 30, the penn international 50, and the 6/0 senator (that has been drilled out).