[Phantom5oh]

you'll need to talk to the machine shop or the balance shop... they can tell you what to buy, but you should also have it internally balanced because 7 ounces of unbalance inside the engine is 212lbs at 4000 rpms... so you don't want that kind of extra stress on it if you can avoid it... depending on the type of crank you have and where you live it can cost you anywhere from 300 to 900 for a good balance job... but it is well worth it!!! since you wont loose the power of the unbalance.... hope this helps...

steve