thanks sawugo for your help, I don't have any Aliexpress references, for mouser we use:
off-on pushbutton: R13-24A-05-BB (you can also find it in Farnell)
2.54 pitch pin header: 710-61304011121
The pin header is easier to find on eBay/Ali, just write raspberry pi pin header and you will get some results. The OFF-ON pushbutton could also be found on eBay although the pins are usually different and you sull need to cut/mod them.
The administrator has disabled public write access.