If my memory serves me correctly, the ribbon spool for this machine is a fairly standard one down the line from their upright and portable manuals to their electrics.  Also, this same spool is practically universal in a lot of foreign and domestic (USA) machines.  In other words, the spool that fits your typewriter will fit an Underwood #5 or a Royal Quiet DeLuxe.  If you have other machines, chances are you may have the spools already.  Whatever the case, if you still have the old ribbon, by all means KEEP THEM SPOOLS!  Just buy you some 1/2" ribbon and rewind it onto the spools.  Tie you a knot about 4" from where the ribbon hooks onto each spool so your ribbon reverse will trip when it gets to the end.  Then thread the ribbon through the machine with the takeup spool on the left turning counter-clockwise and the right at takeup turning clockwise.  If you don't have spools, and if worse comes to worst, a universal ribbon with the core inside it will do until you can get some proper spools for it.  They're everywhere--even some older computer printers used to use those.