The rego tht somehow matches the '199x' is SBS1996X (HGDEP
158).
usually when there are people who put x behind the numbers
without more letters, it means it represents the numbers,
especially since its a MKIV strider, also since its not confirmed
that there's a letter X behind, so it can mean any buses from 1990L
to 1999M. for this, higher possibility for it to be either 1993D
1995Z or 1998R since they run on services which goes past
maplewoods condo.
