BM range: Tweeter protector tripod
part number and dimensions
Part number: 405530

This is the metallic 3 branch part that lays over the tweeter dome.
Products using the tripod on their tweeter:
all BM series (except subwoofers)
All LYD series.
Dimensions:
The diameter is 55 mm -
Each branch length is 27,5 mm
The angle between branches is 120 degrees.