If the standard HP packaging was used, then any other same-sized instrument of the era should have interchangeable cabinet parts. Possible exceptions may be color-matching, or if any unusual features are needed. Also, be sure to get the right ventilation arrangement, which can range from solid to fully-punched with lots of holes. One more thing - depending on vintage, there may be English or metric fasteners (or both) used in the chassis. If you don't already have the screws, don't be surprised if there are some fit problems, easily solved with the right ones..
Ed
