I had calculated the regos for EURO V KUBs and this is my
findings.
1) If rego starts from SBS8562T and skips all '4's, it could end
at SBS8999S, but thats only 393 SBS Euro V buses,
short of 7. Unless SBS decides to use SBS8934D,
with '4' onwards, it will not fulfil all 400 Euro V KUBs.
2) Same theory, but now, if SBS decides to end at SBS8996A,
leaving the last 3 for demo buses, the rego with '4's will have to
start at SBS8904R. It will end the 400 KUBs regos. So,
SBS8997Y, SBS8998U and SBS8999S could be for demos.
3) Related to (1), if SBS insist to skip all '4's, the last 7
buses of 400 will have to use other regos, not starting with
SBS8xxxx anymore.
Hope they could add in the '4's otherwise waste regos space. If
SBST really wants to be so SPST, I hope they use 79XX de rego. cos
9XXX like DD buses like that.