As someone who has bought countless straps for my various Omegas (and others) I wholeheartedly second that! The AD (better yet boutiques) will know the exact model you need. It's amazing how two almost identical watches need such different straps (in terms of whole placement, size, etc). Save yourself the headache and buy the right one. I could open a store with all the "wrong" straps I've bought over the years.
Also, many of the grey market straps I've discovered have been fakes. They often look and feel very similar but after a while they die. Fast! Last thing you want is your watch strap splitting in two and having your watch crash down to the floor (or bottom of the ocean). If it's way cheaper than the price at the AD/Boutique then there's usually a good reason for that.
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