Reference Gauge = HO scale or OO scale. Complete with wires and LED and can be lighted.
A set of 10 Fenders for a Model Boat from 3Dclever (40mm long)
Pictorial A-Z of Vintage & Classic Model Airplane Engines - Mike Clanford (1987)
Master’s Collection: A World of Dioramas II by Per Olav Lund
Triple 9: Hot Wheels Premium Blister Protectors (5x Cars) Size A - Box of 10
1: 350 Russian armored forces, a set of 10 vehicles