The Bendix/King RDR 2000 Installation Manual (006-00643-0007), on page 1-1 states:

"The ART 2000 can be installed as a replacement (with a connector change) for the RS 181A or the RS 811A in an existing RDS 81 or RDS 82 installation. If installed with an existing IN 812A, however, Vertical Profile and tracking are not supported by the IN 812A. If using an IN 182A that is not Vertical Profile compatible, the Vertical Profile feature of the ART will not be supported. IN 182A indicators with part numbers of 066-3084-10 and 066-3084-11 are not compatible with the RDR 2000 system."

In addition, there is a "RS-181A/811A to ART-2000 Harness Connector Replacement" diagram in the RDR 2000 Installation Manual on page 2-99, Figure 2-49.