You do not need the older 15mm chainring bolts, they are for the older supercharger not the turbocharger that you have, that is why they are not included.
Some stock two ring bolts will work (I assume those are the ones that e-13 tested, as they claim that stock bolts work), some seem to be a bit short (shimano IIRC). The old 15mm bolts would be WAY too long for the turbocharger.
You should not be using any spacers with the bash...just the chainring bolt and nut. You will need them to be about 8-9mm.