From what vendor did you end up purchasing? Also, in looking at the replacement blades, there are several lengths listed for the 5/16" bits; do you happen to know if they can all be used? Or does it have to match the one for the specific cutting length (which is what I am figuring, but the way they are listed, it seems like none of the replacement blades are a perfect fit).
I am guessing I will just need to figure it out from the original blade, but being able to order replacement blades at the same time would be nice.