I'm not sure that any stock model loader will actually fit (Kubota doesn't list any as fitting that exact model), as the narrow has an axle case that is too short and wheels too close for the sub frame to fit.
If you think it will fit, other models of loader for the other M7030's versions are M1250, M1870, M1880.
Keep looking on Craig's list, and EBay there have been several listed on there in the past.
I had better luck finding a Woods loader for my L3450.
These older tractors can be rough to find exact parts, you might have to find a comparable model and make your own mounts and subframe.
Give a shout if you need more help finding a loader that will fit, I'm in the Sandpoint area.