After having a relatively lower mileage injector go out on my 240SX (~130K coil failure), I decided to get a back-up set for the 1994 Q. I have not pulled out my stock injectors out yet, but I wanted to know which ones would work? What is the difference between this:

and this one:
It looks like one has some sort of sleeve. Will both work? Rockauto.com lists that both will work. Also, what size are the 1997+ injectors? 270cc? Will the SR20DET injectors work?