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BC-6R
Steel back-can for use with:
SI-615, VM-615, VF-615, VA-615 & VA-607
BC-6RS
Short steel back-can for use with:
SI-615, VM-615, VF-615, VA-615 & VA-607
BC-8R
Steel back-can for use with SI-815/R, VM-815, or VA-815