Fork stem size

[Manifold_Burrito]

Hi folks, I'm looking at adding a phone bracket to my fork stem.
What size stem is it please

I have an 1150gs.

Cheers

 

[Manifold_Burrito]

 

[Timolgra]

Im in the workshop now and had a look but don't think that will fit on a GS.

 

[Manifold_Burrito]

That's a shame looks quite neat.

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