Both items mounted and used for a dyno session and were brand new in the box. Ran on the dyno with probably 10 pulls and then sat waiting for new 540 to be built. Won't work for me on new motor but could work for you. Balancer is a Jegs 8-inch external balance piece and the gear drive is a Pete Jackson noisy set.
Balancer $125
Gear Drive $100
I am located in South OC
http://www.***boat.com/image_center/...s_Balancer.jpg
http://www.***boat.com/image_center/...Gear_Drive.jpg