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I’d never count on anything being strictly ‘standard’ as over the course of time slight changes tend to be made. Bob or Kevin at B.K. Windows in Brundall 01 603 716171 may well be able to help and have a suitable set of lengths in stock. It might also be worth finding out how much they would charge to fit as they would then bring the various profiles with them. It would probably only take them an hour or so from start to finish.