If you can find someone whos converting to PP stuff or electric drives, you can use the factory White cable drives off the 8 or 9000 series. Theres a tiny bit of cutting and drilling 3 holes in the side piece that goes around the unit. You have to convert to the new W style bar mount, they cost about $80/each through parts, but it also allows you to use airbags or hydraulic downpressure like the newer series does if you ever want to go that route. After not having to mess with chains I would go this way or go electric. 


We did this and run them through the Trimble FM1000 and field iq along with the seed monitoring. The guys I got my stuff through had gone with Graham on their 8000 and were happy with them but you have to run their system, AFAIK you cant run the Graham through the Trimble.