Thought I'd try these, but. . .

[Deleted account 250319001]

The park bulb is wrong. When i took the bulb out it was a 12V 4W normal bulb, round with a metal base and bayonet fitting. The advert say's 99 - 2004 BMW R1150GS. and i sent the H1 headlight bulb code. So, do some GS's have these other type? (pictured)

 

[JoeC]

I've got a 2002 GS and it has a 501 bulb as side light.

 

[Stewart H]

I have had both types of bulb on 1100 sidelights, I found a good substitute from a ford in the scrapyard

Stewart

 

[Deleted account 250319001]

I have the T4W Bulb...
They must have changed it after my model