I used the Sears 32 mm and a hammer. Put a bunched up towel down over the radiator pipes, but it was not needed. One whack and the nut came loose. Belt tension kept it from hitting anything. I will try Mango's screwdriver suggestion next time. I don't like using brute force, but I had to get the belts changed. Would have been nice to see a video of wrench/screwdriver beforehand.
Mods: Clear corners and sidemarkers, Debadged
DIY's: Belts, $5 key beep, pulleys, OFHG, oil change