I have a small quantity of these new old stock fuel lines with part number 91135606631. Fits 1974-1977 Porsche 911 2.7 engines. The last pictures shows where it goes on the fuel pump. Looks like these are NLA (no longer available), last known price was around $99 each, your paying only $49 each here, I guarantee these are good and will work without any problems. 

Please see my other auctions for more great Porsche parts including nos (new old stock).