Quantity   Component name
1 × 74HCT138 Electronic Components / Misc. Electronic Components
1 × 74HCT153 Logic ICs / Decoders, Encoders, Multiplexers, Demultiplexers
2 × 0.1uF decoupling capacitors
2 × 6 pin 2.54mm spacing male headers to fit mainboard
4 × Your choice of 2.54mm headers for the 4 SPI ports. They are positioned on the board edge so that 90 degree angled headers can be used to keep the system flat