Inspiron 660s (Early 2012) PSU Fan and CPU Fan

An office with a number of these Small Form Desktops, all working fine.  Also out of warranty. Now fan in one of the power supplies is going bad.  I may as well go ahead and ask about getting replacements for all rotating parts.  So, what is the part number for a 220W PS for this unit, and what is the part number for the fan sitting on the CPU.

Otherwise happy, just wish the thing used standard form parts. Would a Flex Mini-ITX work in this situation?

Thanks