So my guess when tearing this leaking pump apart was that this had a sealed front bearing which is why the shaft is turned like this. Now the question is where can I get a replacement?
Only about 3 weeks ago I had to replace the front bearing in one of those leakless pumps. My local bearing service had one - I just took the old one in, he wandered back into the store and came back with "How many do you want?" which I thought was prety good especially since imperial sizes are not so comon here any more. It was 5/8" ID X 1 3/16" OD X 7mm wide.
If that were mine, I'd replace that shaft with a new one. A two piece shaft is asking for trouble