The last time I bought fuel line, it was from napa. I was able to use the stock sleeves over it. Just take a old piece with you.
Beware of matching up Cannondale fuel line, since that is NOT even basic fuel line, and certainly not the Fuel Injection stuff. -- they gave us hydraulic hose instead, which is why it becomes hard and cracking by now.
If you use C27's suggestion with a rubber-tip air hose, you can easily get our stock sleeving over the 1/4" EFI line. It just takes two hands, your foot or a bench vise, and pulsing air into the end of the new hose section... and into a
stretched out section of sleeve that is closed at the far end. The sleeve will inflate as you inch-worm the hose inside. The technique is quite easy, once you get the hang of it. (OK OK , maybe it takes
three hands I forget, but it's still simple enough)
NAPA is about $7/ft for EFI hose now, but I keep 1/4 and 5/16 in stock for $4.50 and $5.00 per foot, FYI.
Also note, I have HD impregnated heat sleeve OK to 1200F, for $1.50 ft as pictured here. For non-protected sections it is quite nice, as you can clamp OVER it for a clean install (even between injectors), using a size-larger clamp.