This is a new British Prefocus (BPF) or P36 base (12V, 45W) TUNGSTEN driving/spotlamp bulb. It is correct for SLR576, SLR700 and Ranger lamps.
These have a vertical filament, which throws a conical beam, correct for a driving lamp, although they would fit in foglamps as well. MOST SUPPLIERS HAVE DISCONTINUED THIS BULB IN FAVOR OF THE NEWER HALOGEN BULBS. WE ARE PROUD TO BE ABLE TO OFFER ORIGINAL-STYLE TUNGSTEN BULBS AGAIN.
Lucas part no. LLB185.
We will supply these bulbs in the genuine Lucas box as long as we have supply, but if we cannot get that style, we will ship an equivalent bulb in a plain white box.