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)
A set of 10 Buoy Fenders for a Model Boat from 3Dclever (25mm dia)
Model of An Airport Control Tower at A Scale of 1:400 – Decorative Aircraft
Pictorial A-Z of Vintage & Classic Model Airplane Engines - Mike Clanford (1987)