You dont really want the stainless steel reeds. If one breaks and goes in your motor, it "can" trash it.
My daughter has a FX-1 with a 650 in it and a few months ago it started running shiddy. I found a SS reed petal that broke off and stuck to the inside of the intake manifold and didnt go through. i was very lucky. But I have seen them ruin a motor before.
I found some used fiberglass 6M6 reeds from a friend an put them in.
But when I used to have 6m6 or 61X cases I liked the Carb Tech reeds. They are pretty expensive(around $90) unless you can find someone selling a "new" old set.
They will last a long time though.
Good luck.