Micro adjustment clasp

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I have been trying to obtain a micro adjustment clasp for my Seamaster 300M
Contacted Omega in Bond Street who were very polite but because the Seamaster isn't sold with the adjuster they couldn't/wouldn't help!
I think the adjuster type that I am after was fitted to other models as standard.
I believe the micro adjustment is at the opposite end of the clasp to the wet suit adjustment.
Anyone have a part no? The bracelet measures 18mm.

Alan
 
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51
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86
To be quite honest I don't know!
Photo help? It's 18mm wide and parallel to the lugs.

Alan