Wuts it called: fastener to secure AC/heat cable ends?

Where can I find this fastener? It looks like a washer (illustrated in the attachment) and it typically is used to secure things like the ends of a temperature control cable to a sliding lever. MoparMuscle Magazine calls it a "China hat" (retarded name). Also used to keep the FAN/blower motor lever securely fastened to the fan switch arm on 68-70 B-Bodies.
Where can I buy this sort of thing (and what do I call it) as I am restoring some AC/heater controls...

pushnut, avail at most better stocked hardware stores

Lowes and Home Depot has them even