Vertical Card Compass, Instrument Panel Mount, 28V
Fits in a 57 mm (2 1/4") instrument hole.  Mounting screws included.  The light is designed to be powered by 28V but power is not required for the compass to operate.

Dimensions of Compass:

• Total height including adjustment screws on bottom and light on top: 73 mm (2.87 inches)
• Width: 60 mm (2.36 inches)
• Depth: 53 mm (2.09 inches)

 - Note: This unit is compensated for use in the USA.  Versions for the Southern Hemisphere are available upon request.  I don't have them in stock, but I can get them in about 2 to 4 weeks.  The price is $40 extra to cover shipment of the custom product to my office.