ok, my trust filter is 57mm, so i need 38 to 51mm 90 degree elbow - http://cgi.ebay.co.uk/51mm-38mm-90-Elbow-R...=item20a951e6e2 51mm alloy pipe - http://cgi.ebay.co.uk/51mm-OD-x-300mm-Alum...=item20adb1362f 51 to 57mm straight reducer - http://cgi.ebay.co.uk/57mm-51mm-Straight-R...=item1e548239f4 My only question is, item 2, the alloy pipe. ive gone for the 300mm long one (about 12 inches) will that be long enough/too long? and that comes to £32.27, not bad, cheaper than the prebuilt kits by a fair bit