The service manual details crystal specifications on page 3 as follows
VHF LOW crystal frequency (MHz) = Fr + 10.7
VHF HIGH crystal frequency (MHz) = (Fr - 10.7) / 3
UHF crystal frequency (MHz) = (Fr - 44) / 9
Fr is the desired receive frequency in MHz
The UHF crystals are unusual and the more common 10.7 MHz UHF crystals do not work in the PRO-16A.
The service manual lists the incandescent lamps on pages 25 and 30; rating is 14V at 50mA.
This is true. The UHF receiver is Triple Conversion whereas most other radios at that time were only double conversion. So, for example, a UHF crystal from a PRO-5 (which is still 10.7MHz IF) won't work on the PRO-16.