Have short injectors and the fuel rail doesn't reach down far enough? (e.g. Genesis 550cc in AEB/AGU or 16v). The Genesis "Unspacer"; is your solution. These slip on top of short injectors and seal against the o-ring. Powder coated in gloss black, the Unspacer has an o-ring on top that seals inside the fuel rail. Installation takes mere seconds. They're inexpensive and include rail clips, too! 

Parts priced each.

Pictured in blue for display only