Frank,
I replaced mine when I got it with OEM's from Eurospares about £33 each I think and the fit was flippin awful.
I'm not one to try and teach grandma to suck eggs but have you got the shoes to match the radius of the drums by filing and settling them?
If you place the drum face down and pop a shoe into the drum to the right location you can move it round the drum a few times and it will polish the contact points. Remove it an file the contact points, repeat until you are getting 100% contact then stick a chamfer on each end, repeat for the other shoes.