WB did have ADR changes at various times like HQ did.
AWB seems to finish in 12/80.
BWB appears to run into late 1981, possibly changes to CWB at start of 1982 calendar year.
DWB appears around 8/83.
EWB runs for most (if not all) 1984 and 1985. May possibly start at 1/84.
This may differ also between commercials and passenger vehicles like it did in HQ-HZ.

I'll check on the WM engines. VM were certainly around. It may be like HM (manual low comp LX-UC 202) where it was available but none made.