SBS2658R
(HG 109) 
(HG 153)
As I had posted in the Wright thread, reposted here again for
relevance:
2658R confirmed goes to HG 153 with new Harry Potter Exhibition ad,
indirect swap. Plus from cameo lists of others this bus has been
appearing on-off on 153 since 984L came over. Unless you tell me
the ad is for 109, which I think is highly unlikely given the route
of 109 and the ad contract doesn't quite match. Haven't actually
checked the perm stix yet, so someone could double verify for
me. 
Then, 2658R's timings is done now by a Wright so far this week
for weekdays. The timings of the 1st Wright (usually 3060H) managed
to fulfil the timings I saw it along Pasir Ris Dr 12 towards CGV
this week. While 984L (which used to do 2658R's timings) is on
850P's timings now this week.
Indirect swap cause 984L 2658R did not swap one-for-one on each
other's timings, the addition of the Wrights cause the sequence to
be rotated around. Hope this clears things up. 
I believe that with the new ett that 109 got starting last Mon,
there were some reassignment of the perm fleets. SBS850P should be
indirectly replaced by one of the 2 Wrights as well.