injector connector seal.

I have a rectangular seal inside my injector connector. Does anybody have a GM part number for this seal? Is there an alternative meathod to sealing the connector? Also is it imperative that I have this seal in place?

any info will be greatly appreciated.

Probably have to go to some parts shop and get the thing. You may have to buy the whole plug to get the rubber thing. GM parts counter will rape you for it. TPS plug was around $30 from GM but $5 from a parts house.