Since there have been a fair number of questions from folks looking to pick up a used X-31, often a disassembled X-31 or one that may or may not have all the parts that came with it originally, here's MOST of what came with my circa '99 model. Not a replacement for a Real Parts List - but at least it will give you an idea if something is missing.
If you have a part and don't know what it's for - e-mail me a photo - and NOT a 5 MEG raw image out of your digital camera please - and I'll try and identify what it is and where it goes.