JC,
There are two locations that may be able to help you. The first is BCS (Beaver Coach Sales). There are several employees at BCS like Ken Carpenter, who worked at the Beaver factory when your coach was originally built.
The other location is Northwest RV Supply in Eugene, Oregon. They have purchased excess parts inventory from all of the Oregon based motorhome builders for many years, and they have many obsolete parts that can be very difficult, if not impossible to locate anywhere else.
Gerald