Option #1: If you have the cash and are willing to pay a crap ton....go HERE $75.00 (plus shipping) will get you the Japan Nintendo Club release only SNES controller for the Wii. It plugs into your Wiimote like the Classic Controller does.
Option #2: If you have a SNES controller (or NES controller, but I'd recommend the former), go SNES retroport or here for NES retroport . This is the option I'm gonna do shortly, so I can play my SNES games on the Wii, like I use to.
For N64, you are stuck with either the Classic Controller or the Gamecube controller.
*Personal opinion* I don't understand why Nintendo doesn't release the SNES controller (or others: NES, Genesis, etc) here in the states. I know that I wouldn't be the only one who would buy them, just to have the "old feel" again....