If you don't have any joy, I used a firm called Extrudaseal when I was looking for some seals for my last house.
They offered a service where if you can't find what you're after on their website, you can send them a photo or, in my case as it was a really unconventional seal and was half disintegrated so hard to tell what it looked like anyway, I posted off a sample to them and they sent me back a number of samples to try.
Their price was really good too, I looked up my invoice just now and I paid £110 for 150 metres of seal, including postage. That was in 2004 so it's probably closer to £150 now but still feels reasonable to me.
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