alwayssideways

I have a rebuild that was done by RR. well somewhere in the dissassembly of the block (done by me) and me getting the block back i somehow lost the flywheel keyway. I went to install my flywheel today low and behold its missing. My thing is ,, i have to have this engine back in the car by monday. I have talked to a few people and places. Ive been told to try home depot, i talked to someone at Autozone and they said they have a generic kit that has a bunch of different sizes. I would have tried the mazda dealer but they were closed allready. BUt my question is our keyway a normal or common size to the point where i can get this from a home depot, autozone , advanced auto etc if the mazda dealer comes up short???