From what I know about the G-2300 line and the now-impossible-to-find strap adapters, AND from PacPart's website, it looks as though the G-2300-DM strap you linked does not attach directly to the watch, but instead uses strap adapters.
(I see that you're in the UK, so http://www.tiktox.com is probably your best parts source, but PacPart's site and parts database is a great source of information!)
The 2300 strap adapters are slightly different in appearance from the usual 5600 series strap adapters, and are curved to match the appearance of the 2300 watches. They both share the same 16mm lug width, and are otherwise interchangeable.
Edit: the "old," dark gray metallic 2300 adapters have been impossible to find for more than a year -- PacPart's website shows some colored ones as "Not in Stock" but I have no idea if they can still get them.
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