These injectors are intended to be used with the 300-260 intake manifold. They are NOT a service injector for the Sniper EFI TBI Product Line. Designed for use in setups with a 38mm distance between the o-ring seats on the fuel rail and intake manifold (commonly referred to as an "LS3-Style" injector), this injector features a USCAR connector and 14mm o-rings on both ends. It is an ideal fit for Holley EFI Intake manifolds that include fuel rail brackets for shorter LS3/LS7 length injectors. However, when used in an intake manifold designed for factory LS3/LS7 injectors, the bottom o-ring needs to be replaced to ensure proper fitment.