Have the following BSB bearing birdcages:

LR two-piece bearing birdcage with swivel shock mounts ($75 each- new) with lock rings.  $175.

RR or can be used on LR bearing birdcage. Is one-piece (non-lockable) with standard bolt-on shock mounts. $100.

Brake floater- BSB with lock ring.  $85.

Both have the adjustable drop shock/eliminator mounts and are in good condition with the BSB heim spacers.  Parting out my DW and my new chassis doesn't run this type of birdcage.