I would like to try my hand with your blanks.
I searched E bay but i can not find blanks in the size for your big lock.
In fact the one seller who had blanks in your size had a false picture up beacuse the key blank in the picture was scaled on a ruler. The ones i got are not that size.
They measure at 1 1/4 x 3/8.
Good news is i have a few locks that will take that blank so it was no loss.
The blank for your lock should be 1 5/8 x 1/2
