Most window fabricators / double glazing companies should be able to sell you that. Best to take a "sample" of existing with you - so you can compare with what they use on their windows - there are a few variations depending on window system used

Also have a look at http://www.reddiglaze.com - They supply the trade.

You will see varying types of gasket at http://www.reddiglaze.com/profiles.html

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