This may help you out a bit cheers
THE ADI Is an ARU 11, 5.25 inch 13.335 cm tall by 5 inches 12.7 cm wide.
The altimeter is a an AAU-19A/A 3.25 inch 8.25 cm square
The RWR is 3.25 inch 8.25 cm square as well
fuel flow and RPM indicators are 2inch 5cm dia
The AOA indicator , clock and VVI are all 2.375 inch 6cm squares