Hello,
I had to replace the two on my 3.2! I hunted high and low for cheaper prices then £250 but everyone seemed to supply them about that price.
http://www.type-911.co.uk £240+vat
http://www.porscheshop.co.uk £278+vat
I ended up getting them supplied from
http://www.911classic.co.uk £225+vat and he fitted them at a very reasonable cost (could not be bothered to climb under the car at the time).
After I had them done I was told that the cheapest solution was to get them made by a place that does hydraulic and high pressure hoses but I have not investigated that option yet. I have heard of similar places charging £50 to £100 to make up similar pipes.
Hope this helps!
Good Luck.
Neil