Place to buy quad rings?

I need to service a KS seatpost, and there are a couple of seals I need to replace. Specifically, BS 113 and 114 quad rings. Like this:

O-rings in the same sizes are easy to come by and would do in a pinch, but quad rings are the original spec and I’d much rather stick with that.

What I’ve found from a few hours with google:
Fleabay: Nothing in UK.
UK: £15 posted for one of each.
USA: £20 – 30 posted for one of each or small batches.
Slovenia: £15 for five of each, and a long wait.

Anyone got a decent source for quad rings in the UK? Most places I’m finding are of the “ring us up with dimensions and we’ll make you a few thousand” variety.

Turner use them as seals on their bush kits, spent ages trawling the net trying to find replacments for perrished ones but never found anyone in the uk selling them. If I remember correctly some companies called them X section o-rings/seals too.

Ah, right. Thanks. Yes, I found x-ring listings too, but all abroad. I’ll ring South Coast Suspension tomorrow, and if they can’t send me any, Slovenia it is.

Have you looked here?
http://maydayseals.co.uk/35-quad-rings
Never used them myself but found them when I was looking to do my KS dropper but it didn’t need new quad rings in the end.

Oh, fantastic! Many thanks.