Doug,
Go to the hardware store, plumbing section and get plastic pipe the size of the air filter, one elbow, and a short straight piece, make a plate to adapt elbow to top of carb, drill a hole for the stud, and cut very short piece of tubing at an angle to set against the elbow, put stock wingnut back to hold it on. You could use a 30 deg bend to angle it down behind the headlights. should breathe as well as the stock filter, maybe a bit noisier.
Eddie