Not a ski area. There's a company called Superior Tramway that makes replacement parts for Riblet lifts, among others. They are based in Spokane, Washington, just like Riblet was.
Riblet rose to prominence back in the 60's and 70's, during a rapid expansion of the ski industry. There was demand for a simple, cost-effective, easily installed lift, and they provided that. The thing that most set them apart was that their grips were woven into the haulrope instead of clamping down on it. As the years went on and technology advanced, Riblet had changed their design very little. They simply didn't keep up with the times and couldn't compete. What's problematic today is that their chair, grip, and sheave designs are not compatible with anything else that's currently available. That makes it hard to overhaul a Riblet lift. You either have to keep it unmodified, or replace the whole lift from the ground up. A lot of lifts from out-of-business manufacturers had parts replaced with those of a current design. For example, Sunday River's Yan lifts all have Poma sheaves. You can't do that on a Riblet lift. If you replace the sheaves, you have to replace the grips and chairs.