The system 246 should look like thisIf you are willing to pay shipping on one from the US...I have one. Came out of a fully working TC3, with working CDRom drive. I do not have any I/O boards for sale though....so hopefully you have one already.
120 USD+ shipping to Ireland.
Let me know if this helps.
I have a twin Ridge Racer machinehow exactly are you planning to run this?