A hard drive in a RAID is just a hard drive. No More, No less. So, once you have transferred the contents of your RAID to your new larger drives, and you are left with two smaller, older hard drives... you can put each one in an external hard drive enclosure and use them as separate portable hard drives.
Take a look at those. There are two different kinds mixed in there... enclosures that would connect to SATA type drives (two plastic blades with copper contacts on the end of the drive), and enclosures that could connect to IDE type drives (two rows of multiple pins - 43 or 44 total depending on the drive). No fancy tools needed. Just purchase the appropriate one for your drives, connect the included USB converter to the end of the drive, slide it into the case, screw it closed... and connect to your computer via any available USB port. The first time you will need to format the drive, to wipe out any existing format, but after that, you can start storing music or movies, or whatever you want on the drive. Then, just store it away, take it with you... whatever you want.