for those of you looking to put together a homebrew flex fuel setup i thought i'd share the part numbers for the relevant gm parts compatible with the zeitronix ecas.
sensor: 13577294 available
here for ~$82.
sensor pigtail: 13352241 available
here for ~$9.
gmpartsnow.com seems to have the most reasonable shipping rates for priority mail of all those clone gm parts sites. anyway, just leaving this here in case anyone comes looking...