You're probably going to have to find a vendor that sells CVT parts. A dealership isn't going to handle something this specific for a CVT. I looked and couldn't find a reference for something like this on any Mitsubishi parts websites.
Here's an example from a CVT parts house in...New Zealand?!?
I'm not saying this is the exact part you need...I just put this here as an example. But I would imagine a place like this could probably hook you up with what you are looking for (at least they speak English in NZ!). Or look around online for a CVT parts supplier in the US.
View my fuel log 2015 Mirage ES 1.2 manual: 52.2 mpg (US) ... 22.2 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)