Put on the valve cover FIRST, THEN work the elbow into the rubber grommet. It takes a little force and wiggling, but it will go in, a lot easier than it came out. If you look at it when it's out, you'll see the end that goes in is tapered to let it in, but not let it out.
And the hose to it, let me guess, broke at the rubber end to the elbow, right? They usually break there. Get a new one if you can or rig up a hose. It is a vavuum hose and you don't need a leak there.
96 GC Limited V8 245,000 miles Scrapped
04 GC Limited 4.0 264,000 miles
96 GC 4.0 175,000