SBS8649C
(HGDEP 315/EB15)
(HGDEP SP/EB15)
SBS8649C has been very inactive from Service
315. Its slot on 315 is getting subbed by other KUBs/Citaros
daily. 
SBS6134J
(HGDEP SP)
(HGDEP 317) > Replace 883U/955X
8649C is still perm though. Most of the time perming S shift,
but S shift for 315 always taking citaros or perm buses like
936B.
For 317's case, 6134 and 6137 should be perm alr picking out 883
955; making 317 100% wab.