Is there a source for 6x7 or 7x7 galvanized wirerope???

[Clyderigged]

The more I search and phone around for smaller diameter 6x7 or 7x7 galvanized wire rope, the more I am convinced it has become the Loch Ness Monster of the wire industry. My experience thus far, goes like this - 6x7 is advertised on their web page but when the salesman looks up price and quantity--- lo and behold, none is available and then try and sell me 7x19.
Anyone else have this problem. A friend of mine is re-rigging his large ketch and needs 6x7 or 7x7 galvanized IPS in 7/16" or 1/2" and some 3/8" diameter.

Anyone else have this problem finding smaller diameter wire rope???

Thanks for any leads or ideas. I have found larger, over 1" diameter in Bilbao, Spain - but that might be a bit overkill

Regards,
Jamie White
Clutha Fecit