This is a 21D83M-843 Furnace Control Circuit Board Lennox White Rodgers.  It is new in box.  Free shipping from US seller.

Replacement for OEM Part Number100925-01; 100925-03; 10M9301; 12L6901; 17W9201; 21D83M-843; 23W5101; 24L8501; 30W2501; 32M8801; 50A62-120; 50A62-121; 50A62-820; 50A65-120; 50A65-121; 50A66-122; 50A66-123; 56L8401; 63K8901; 69M0801; 69M1501; 83M00; 97L4801

Kit includes: 1 – 50A66-843 ignition control board 1 – Wiring harness (9-pin to 12-pin) 1 – Wiring harness (4-pin to 6-pin) 1 – Mounting panel 4 – Stand-off fasteners 1 – Circuit breaker 1 – 4" blue wire 2 – Wiring diagrams