Are you looking for the rubber piece that is L shaped coming from the hard line into the back of the filter? If so advanced auto keeps these in an isle and I found it at both the stores in my town. It is an S shaped piece of vaccum hose and u just cut it down to the size you need. It should be in the same section as the little pcv valves, they r the small elbows on the top of your valve cover. If you can't find one I believe I have the other half out in my garage sumwhere, I'll be glad to ship it to you if I can find it haha.
If I were you, I wouldn't plan on your vacuum hose lasting too long...because it is NOT designed to be compatible with gasoline!
The vacuum hose will likely start deteriorating on the inside and crumbling apart. I'd bet the crumbs will begin to plug off your filter and will begin leaking in the not too distant future.
In my '95, I just replaced my fuel filter again (it's been 2 yrs) and because my 'elbow' (inlet) rubber hose was in bad shape, I replaced it.
I used a section of 3/8" rubber FUEL hose to make the connection. Prior to fastening the hose section inline, I wrapped a section (~10") of soft, smooth wire around the middle portion of the hose. I then fastened the hose to the filter inlet and to the steel feed line. The wire-wrapped center section did not pinch - because the wire supported the hose and it kept it from pinching off.
If you want to know more, here is a quick read on more-than-you-ever-wanted-to-know about types and uses of fuel hose: http://www.gates.com/downloads/BarricadeBrochure.pdf
In the gates information, you may notice that they mention carb'd systems can use the low pressure hose with a max working pressure of 50psi and that injected systems should use the high-pressure hose that has a working pressure of 225psi.
Now although my '95 YJ is fuel-injected, I doubt the fuel pressure AT THE FILTER would see 50psi, so I used the low-pressure hose at the filter.