Saginaw power steering pump whine and leak

The bushing centers the shaft in the seal. Bushing is the only hard part I have found available. I don't know if or where vendors like Cardone get shafts and other parts for these pumps. I have placed a homemade spacer behind the seal so it sits on a unworn spot on the shaft. My memory sux but I think the piece I made was .042 thickness.