On that JDM-020, the smallest circled component is a Resistor that is 100k, 0402 size. It's the only critical one. The other 2 are just decoupling Capacitors and you could put anything from 1uF to 10uF in there or just leave them unpopulated.
On the JDM-030, Top side of the board, the component at the bottom is also a 100k, 0402 sized Resistor and needs to be installed. The other one is just a decoupling Capacitor, 0.1uF to 1uF would do and it is not critical. Bottom side of the JDM-030 board is also just a decoupling Capacitor and same applies to it.