1:35 scale headlamps in domed metal covers, as seen on Finnish tanks from WW2. These can be used on captured Russian tanks like T-34, T-26, and KV tanks. Each unit consists of a cover, a lamp (fits on a pin in the cover), two hinges, and two wingnut locks. These have 1mm diameter mounting pins, and there is a cross-shaped drill template included for correct location.
Also included are four half-sized domes (without the hinge or lamp parts) - there is some evidence to suggest their use. (Or trade 'em to a 1:72 scaler!)