Really not a silly question. Keeping track of all those jack sizes can be important, especially as the power brick usually fails before the device. Unfortunately I don't know the answer. Recently I bought this adapter that comes with many jinterchangeablevtips.
Unfortunately that's not an option for my use case: the power supply is fine, but I need a barrel jack extension lead of the correct size to make the power wire longer. Context: I'm using my eMate as a serial terminal for my rackmount kit, and I need a wire long enough to run to the PDU of the rack.
Yup: though I'm in the UK, so our outlets are slightly bulkier . But I already have a UK PDU in my rack along with my IEC PDU, because I've already got a bunch of stuff that uses wall transformers in there (RouterBoards and my LC II hack). So it will make the wiring a lot more manageable if I can get a barrel jack extender, rather than having the newton PSU hanging about on the end of a wire. But I may have to go that route.