I was able to get an upper unit of a Racore 1500 for the PCjr. Many Racore Expansions have the standard 5.25" in them (model 1200) and then some even had 3.5" drives in them...what makes this one cool is that there is a HDD installed! The only thing missing is the double-height sidecar, and therefore is pretty useless at the moment. Does anyone have one of these sidecars for the 1500 in a pile of "Stuff" by chance? That might seem funny, but that is how this top unit was located, however ut seems to be in pristene condition. Thanks! Brian Heise