Early pattern cylindrical rear lamp with side number plate illumination, as Lucas type 582. fitted with prismatic lens and screw on metal rim. 45mm dia x 93mm overall, body 42mm dia. - double contact equal pin bulbholder. mounts through 20mm panel hole. offered in black and plated. Accepts BA15d indicator bulb, for spare bulbs please see our B319 (6v) or B335 (12V).