If you don't mind the extra conductor, you could use this servo extension wire:
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LoginI purchased this exact item from this seller about a month ago. It says 10-22 days ship time but I got my package in a little over a week. Looks exactly as the pictured and it does fit. This seller has it in different lengths/amounts and does sell a two conductor one, but I don't know if it has the correct spacing.
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LoginOne warning, make sure you read the descriptions and the shipping costs carefully. This seller has listings for the same item. One set has a higher cost, but shipping is free. The other will have a low price, but you will have to pay for shipping. The final price you pay may be different, depending on which way you go. Also they sell different lengths. The pictures they use are different, but since there is no scale the 300mm extension cable looks a lot like the 50 cm cable to me