The filter is K&N part # RC-0170. The vent tube fitting is 85-1120.
http://www.knfilters.com/performance_accessories.htm
Check out the "Universal Filters" and "Air Filter Accessories" sections.
They have lots of different shapes and sizes of filters; the problem was finding one that fit the space I had. I originally chose a larger filter and had an extension fabricated to clamp on the intake that would have moved the filter up and over the top of the engine, but after having the extension made it wouldn't fit on the intake. (Guess I measured wrong!)
Drilling the hole through the thin metal of the top of the filter was a little scary; I did it from the inside of the filter. With a hole that big (9/16) the bit really wants to grab that thin plate when it finally breaks through. Clamping the filter is difficult without crushing the element. (One reason I was hoping to find a filter with a rubber top that would fit...no luck.)
I tried to find the 90-degree vent fitting elsewhere (to avoid paying $11 for it!) but couldn't find one with the NPT threads and nut, so I just got it from K&N.
I did a search on the internet about gluing nylon and it seems this is a very difficult, if not impossible, thing to do. Someone on another forum recommended GOOP adhesive.
Do you really think teflon tape would work? I thought that was more for preventing leaking than actually bonding.