Not a problem really, if you scour the net and ask for "YICS tool" you should come up with a load of diagrams and other stuff that should help you out, there are a lot of American guy who have made these things and they have posted pictures and dimensions on various websites, all you need to do is find a picture and parts list your happy with and go from there. The only problem some might have is that the Americans use Imperial (inches) rather than Metric so as long as your old like me it's not a problem, sure you can cope with that. Anything else you need then give me a shout, good luck.
PS one thing I almost forgot, CLEAN OUT the YICS pathways BEFORE you insert the tool, undo both bolts either side of the head and run a cloth through to take out the accumulated crap that will be in there, it will rip the rubber washers if you don't do this, I know this from experience!!! DO NOT turn on your fuel until you have replaced both bolts, YICS tool stops cross flow of fuel but NOT from running out the sides if you leave the bolts off.