All you need is a 520 chain and a 17 tooth 520 sprocket.
Here is a link to a total kit with a gold chain (stock sizing I think though). Don't know why it says conversion as the fz6r is already 520. (fz1 is 530)
Also, why do you want to go plus 1 in front? What type of riding do you mostly do?
I used the stock chain for my +1 and I just moved the rear axle forward. As long as you're not already towards the front of the adjustment window you should be fine ordering the same length chain as stock (not sure how many links that is....would have to go out and count)
Yeah I have the Driven front 17 tooth sprocket and it works well with the stock chain. Like was said previously, all you need to do is make sure it is adjusted to the correct tension and you're good. No need for a longer chain at all. The increase of 1 tooth up front does not increase the sprocket diameter (and therefore circumference) an appreciable amount, so the center to center distance only needs to move a quarter inch or so to keep the same chain length. Easily accomplished with the axle adjustments in the swingarm. Good luck!
indysuperbikes.com has everything you need, for most of the time cheaper! Vortex sprockets and EK chain. Just so you know about colorful chain... the attach link doesn't come in color... So when I cut the chain, I carefully cut/kept a color link and used the "side plate" on the outside link.
I went for the red chain and sprocket. I tough it would look good... well, it look a little gay! LOL I'll go black next time... like in 5000 miles or so.