Ok here's pix of mine, complete with very dirrrrrty engine compartment:
I used a 2" test/knock out cap, 1.5" test/knock out cap and a 1" plug.
Another shot:
The "ring" you can see on the far end of the PVC is about 1" of a 3" coupling. There's no need to use a whole coupling for an application like this. I didn't even glue it. I shaped the 2" of pipe that protrude into the fender and still had to beat the "bit-o-coupling" onto the pipe. Trust me, it ain't moving.
I had cut the coupling to match the Downspout Connector but then decided I didn't want to use the DC. Used the coupling anyway because it looked cleaner than my shaping job and I'm keeping an eye out for a suitable sealing material to go between the "bit-o-coupling" and the fender. Partly for a more factory look, partly for grins and partly out of OCDness...
Sawzall really effed up part of the tubing, the guard scratched it up some... ach well. Maybe some other day I'll work on cleaning that up. Fixing that will mean smoothing the whole thing though.