Brick opening size is just shy of standard window sizes

Hey all,
I am currently in the middle of replacing a kitchen and the current benchtop runs out across the window sill in a peice of design genius... I'm going to have a couple of courses of bricks laid and a new brick sill to bring up the bottom so I can have a short splashback.

So I'm going to have to replace the window - the current window is the aluminium frame sliding type set on a basic timber reveal. I'd like to replace it with a "standard" size(stegbar and the like) but my brick opening width is 1790mm - looking around at the standard sizes they're all 1800mm or 1810mm.

I really need some advice on weather I'm just going to have to pay for a custom window in this case or is there some other direction I might be able to take?

These are what I've been looking at: http://www.stegbar.com.au/pdf/Stegba...dard-Sizes.pdf

Thanks!


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