40 A 45 Tooth Plate Style Sprocket CNC Machined for the Peerless 100 Series 1" and 3/4" Differential. 

It has the 4 bolt hole pattern drilled and has a 2-1/8" ID to match the hub. Peerless # 786041A .

Use # 40 Chain 1/2" pitch x 5/16" width. 

Black Finish is standard.