I found the part I needed without difficulty and ordered it from an easily navigated website. It was delivered in a timely fashion.
Switch box base & switch assy for bw4002
Switch box base & switch assy for bw4002/4502/5002/5502 wh4bl (back) wh5bl
Buy this part and as many parts as you like and pay only $9.99 shipping, within the Contiguous United States.