HI Simon
I have just replaced them on my 164 I used silicone ones it is better to drain whole system then you dont get much water into the car as you look at the hoses do them from bottom up it makes it easier also if you can get silicone you should never have to do them again.
Try this company
http://www.classicsiliconehoses.com/ for the hoses.
Hope this helps you can PM me if you need more
Good luck
Malcolm