HP Pavilion PC with new SSD

[cyclones]

Motherboard came in today and the power pins look good and will fit fine. The thing I forgot was a PSU.. HP didn't have a PSU installed in the system since it was using it's own 12V AC Adapter. I'm assuming I would just need a Mini ITX power supply or would a regular ATX12V fit? From the sizing, it looks like a ATX12V would fit but not exactly sure. Here are more pictures if needed: https://www.dropbox.com/sh/7db2uq88dzfe9b3/AABYkCiP3I6_SDjyxAOAtIzXa?dl=0

 

[PP Mguire]

Might be able to put an SFX PSU in there. WIll need to drill those rivets out though.