Sorry bud but I don't have a 5.25" floppy drive to spare. I have two but they are both in use in classic computers. As for 'will it will it work in a new computer', theoretically yes. Most BIOSes still give you the option to configure the floppy drive as 1.2mb, 5.25" and windows XP is supposed to support 5.25" disks though I have never tried that myself. Be aware that most new BIOSes only support one legacy disk drive at a time so setting it up for 5.25" will likely mean that your 3.5" drive won't work until you configure it back. The only other thing you would need would be a ribbon which supports the 5.25" interface to attach it to the motherboard. It looks like this.
Good luck in your search.
...bysmitty