So....
americankeysupply.com is telling me that I have the wrong information....
So basicaly the M15 on the website does not reference masterlock but Hillman and Curtis. I am trying to explain to them It needs to be a Master 15 or MAS 15 but I cannot find it on the internet anymore. I need to send them a freaking lock and telling them to start inserting freaking keys at this point.
I am trying to do some more research... if anyone that has a 100g and different blanks try and see if they work let me know.

I just picked up a box for the lock and it hit me. M10 is on the box. Do locks usually have the key number on the box?