Just did a quick Google search and it looks like all of the ones sold at common stores require a decora-style wallplate. Do you know of any that fit a traditional flip switch plate? We have this nice wallpaper-covered plate that would be nice to reuse... I believe I have this exact unit - if not, it's a similar one from Leviton. I bought one brand, it didn't work at all so I got the other.

I have a thread in /r/askanelectrician about the issue where I was told I needed a newer dimmer that supported LEDs. The existing one was from the mid 90s and wouldn't power the bulbs beyond about 10% their max brightness unless I put an incandescent in the circuit.