I believe that the Left hand refers to the position of the clasp on the front, which on these is off centre to the left.
4mm Scale Whitemetal Classic Car Kit (Not Sure Model) 1:76 Scale Model Railway
a.b.s Models 4mm Scale Whitemetal Detailing Parts Please Choose From the List
Kenline 4mm Scale Whitemetal Fittings. Please choose from list
4mm Scale Whitemetal Bogies #18
Pair of 4mm Scale Whitemetal Tank Filler Caps Unused #1
Pair of 4mm Scale Whitemetal Bogie Sides For Spares #22