Best kind of fuel injectors

[WeaponX]

I have a 2005 trailblazer LS and one of the injectors are ticking like a bomb so I figured might as well change them all but having a hell of a time finding them so any help would be great. Thanks guys

 

[Mooseman]

They are available all over the place like RockAuto and Amazon. Try searching for number
Delphi# 25358575