Have you looked to see if connectors are just screwed in or connected to a single pcb? Otherwise you can do something like this. https://www.amazon.com/Female-Screw-Panel-Mount-Motherboard/dp/B010NBLRHK

Amazon alone has over 1,000 results so use that as an idea to narrow down a piece that fits what you are needing for this case. Also make sure to check what motherboard connector you have as there is a new version out..

I got this cable and had one end snake out the bottom of the case to go to a main usb hub and had the other end stay inside the case to connect to the front usb hub. I stuck the front hub on with double sided tape.