I am a newbie with regard to interface cards and would wish to buy a card but I am not sure which one will do the job.

I intend purchasing the Captain and F/O sixpack annunciators and master caution and fire warn switches from Sismo Soluciones, the LED's of which are 5v. These components can be ordered as common cathode or common anode. I note that PoKeys sell a LED extension board which appears to be a common anode board so is this the board on its own that will do the job? Or do I need to connect it to a PoKeys56 usb? And are all PoKeys cards common anode only?
I have Prosim 737 as my avionics suite.
Many thanks in anticipation for any help