Do they make a digital audio cable that fits older receivers?

Yes, there are digital audio cables that are compatible with older receivers. These cables are typically equipped with RCA connectors on one end and a Toslink optical connector on the other. This allows them to be connected to both older receivers that do not have optical inputs and newer receivers that do. When choosing a digital audio cable for an older receiver, it is important to make sure that the cable is long enough to reach from the receiver to the source device, and that it is of a high enough quality to provide clear and accurate sound reproduction.