Depends on what has happened but if the pot metal housing or the flat plate working the shaft has broken most likely you will have to replace the complete assy. If something inside has broken then depending on what it is the vendors Max Merritt or Kanter may have individual pieces or individual assys. The complete assy pairs are available on ebay and probably vendors too but there seem to be some differences in what is listed and offered for 48-50. Here are a couple of examples.
http://www.ebay.com/itm/1948-50-Packard-Door-Lock-Assemblys-Matched-Set-With-Key-/321746011323http://www.ebay.com/itm/New-Replacement-Door-Locks-With-Keys-1942-1946-1947-1948-1949-1950-Packard-/400871456678?hash=item5d55ccffa6:g:ShQAAOSwVFlUAFSR&vxp=mtr Even though they are both identified as fitting 48-50 you will need to measure yours. The shafts look to be different lengths and the one listed for 42-50 may be too short.
It is good you have the key to yours. Hopefully the cylinder is OK and you can just swap it into a new housing so as to keep the same key. If the cylinder end is broken Max and probably Kanter have bare unkeyed cylinders available. Take them both to a locksmith and have the new cylinder keyed. Worst case is you have to buy a new assy but you can still have it rekeyed.
Used are also a possibility but again it depends on what is broken. It also really needs to have a key or if you need a cylinder, be a bare cylinder already out of the housing. There has to be a key to remove the cylinder from the housing. Unless you are good at picking locks or have a good locksmith that can pick the cylinder, buying used with no key may not work out
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