6.0 Starter grinding on flexplate

[ubac]

I have a 6.0 engine, 4L80E trans that I believe is a 2001. When I got the engine, the nose cone was broken on the starter. I purchased another starter and it is grinding\hitting against the flexplate when I try to start the car. When I compare the old and new starters, it appears that the previous owner ground down the teeth on the starter in order to get it to work properly (which you can see in the pictures). It also looks like the nose cone was ground down too. The teeth on the starter rest about half way on the teeth of the flexplate. Does anyone know the proper way to fix this? Is there a spacer or something needed? is there a different starter for this engine with a shorter nose cone so it doesn't touch the flexplate until the ignition is turned?