4 wheel sets = 8 wheels and 4 axles.
Gear Fitting for the small scale modeller with no workshop - Mike Sharman
Michael Clark Masokits Masterbits Range 4mm Scale Parts Unused
Alan Gibson 4mm Scale Parts Unused Please Choose From List
3 x Mike's Models 4mm OO/EM/P4 50:1 Gear Set For 3/32" Shaft & 1/8" Axle -Unused
Joblot of Sharman 4mm Scale Plain Ended Axles #2
4mm Sharman Loco Bogie Wheels 12.5mm 10 spoke x 2 axles kit Built P4 18.83mm