I am telling you it is the muffler defibulator oring!  It looks like it is an extra one. Did you replace the IAC or the TPS? If so it is probly the original one and it must of fell off when you pulled the part out of the TB, and the new part came with one. But I like my first answer best, muffler defibulator oring.
Have you started the car yet to check for any leeks?
__________________ 2002 WS6 T/A 408 Iron block, 80# injectors, Fast 92TB, Ported L92/LS3 heads, GM Single Plane Intake, Black Label Fuel rails, Ross Pistons, Eagle Rods, Eagle 4" Shaft, 230/240 114 center, DIY Rear Mount GT-88With FMI, DIY daul 340 Walbro pumps, Self tuning with HP Tuners, Built 4L60E, Moser 9", 3.70 gear with Strange Pro Spool.  |