Barry,
Here's a link to another Vacuumland thread about Hoover Portable cleaners:
http://www.vacuumland.org/cgi-bin/TD/TD-VIEWTHREAD.cgi?36170_10
Looks like your parents' was either a model 2110, with the seal griege (brown) tools or the model 2204 with the oyster white tools. The former's casing is like Hoover's autumn gold color, while the latter's is similar to Hoover's ceylon yellow hue.
I'm not a Hoover expert but just thought I'd shed some light on the subject.
Hope you're able to find the Portable like your parents' for a fair price.
