Thanks for the picture. If you think you can use the same shaft, you could sand where the seal and brake drum go with some fine sandpaper. Wipe it off with a clean rag when you are done.
I would recommend that you replace the oil seal behind the brake drum, visible in your picture. The seal in your pic looks like it is in backwards, I think the lip is pointed towards the brake drum. The seal lip has to face towards where the oil is, in the final drive unit. It was probably leaking because it is in backwards, they don't seal too well facing the wrong way.
To remove the shaft in your pic, you remove the small round cover with the 4 bolts holding it on, and slide the axle out through the hole. Then you can remove the seal with a hammer and punch.
Maybe you knew that already.
Here is a pic from TM Tractor showing a seal the right way.
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