Welcome to BF! Yep, looks like an early 70's PX-10. I'd add that the stem is also probably a replacement as the original was usually an AVA. It looks like a bike that the original owner must have enjoyed and rode.
Replacement parts should be easy to find but as always you'll end up paying a bit more buying them one a time. One good bet would be the ISO sub-forum here. I have an identical but too small PX-10 that I'm planning to part out. If you're thinking you want to make it original again I can certainly help out with parts but I'd say all the newer parts on the bike will out-perform the original ones. Peugeot blue is a great color and it looks to be in great shape. Nice bike!