I bought this one
https://www.amazon.co.uk/FAT32-Floppy-D ... B008HYVFIW The original drive is easy to swap but the side brackets holding the HD and floppy drive need to be removed so the side screws of the floppy drive can be removed, there's four nuts holding the side brackets, they're a bit hard to get to but either a socket with an extention or long nose pliers would work.
The sticks I have used are nothing special, the one 515mb and the other 16gb, you just need to download the Floppy program to your PC, arjepsen has kindly supplied a link on this thread.