Thanks, guys. The part is definitely no longer available on every site I've checked. I figured there would be a bunch guys here with them just laying around, after modifying their bikes. I had considered jamming something (piece of wood) into the rear of the air box to get a tight fit. I may try to make one, as toolguy suggested, but I don't have a good picture of what the original part even looked like. I had seen some UNI filters available on ebay (but wasn't sure if they were a correct part), but will also check out the EMGO filters.
-pm