I think you can get just the connectors set, but its prebuild so its not guaranteed.
https://www.cnet.com/products/asus-essentio-cm5571-br003/specs/
also be sure your PSU wont fry, prebuilds are fitted to the point of ridicule.
check the old MBO connector name and google it. I bet some solution exists, should be easier to search with EXACT info what we are searching for.
front panels mostly look like this:
https://i.ytimg.com/vi/_VnK-WCT-mI/maxresdefault.jpg
thats why its a lot of small cables.
Also if you want to have some fun, make custom connectors set is an option,
https://mnpctech.com/images/companies/3/spst_toggle_pc_computer_install_guide_power_reset_red_fighter_pilot_mnpctech1.jpg
this kind of "power switch" is nice.