Please would someone let me know/have pictures of the headlight bulb that fits this style of holder (see attached photos). It looks to me like there are 3 locating pins.

Thanks.

P15d base?

www.classicbulbs.co.uk/products/p15d-25-...erse-and-v-filaments

Thanks Mark - that type looks a distinct possibility.

Edit

The benefit of having a bike shop 5 minutes away!

Not a P15, but a BA20 - apparently BA = bayonet and the number is the diameter of the bulb base (mine is 20mm).

Makes perfect sense...  in the picture can't see deep enough down the slots to see they make a 90 degree turn to lock the bulb in place. 

Looks like it's type BA21D.

Interesting is HAUT a brand? As it signifies 'upper' or 'top' in French. Was this a European model ie not UK?

Um following my thought you can google 'ampoule a phare a trois ergots' and find pictures ie bulb with 3 prongs (sorry I dont know anything else about these bikes )

Hi Al,
lokating pins are like H4 Bulb.
But the connectors dont fit.
Strange...
unitrailer.de/product-ger-2843-TT-Techno...5-W-P43t-Sockel.html

Hello Wessi.

I've ordered some of these, so fingers crossed they do the job.

Phillips Duplo 6V 35/35w clear Bulb BA21D (Marchall double contact) Type 6725-86 | eBay

"Interesting is HAUT a brand? As it signifies 'upper' or 'top' in French. Was this a European model ie not UK?"

BA21D bulbs arrived today and I confirm that they are the correct fit. However, pins are equidistant (unlike APF bulbs), so it's a matter of trial and error before you find the correct orientation.

I checked the location of 'HAUT' on the holder and it does signify the top of it. There is also a locating pin for the holder in the lens.

This style of lens and bulb holder were fitted to some mainland European models. I managed to find a DT125MX headlight in France that, with not a lot of persuasion, fitted quite nicely into the original DT360A headlight rim and inner ring.