It's hard to read and understand what you really mean.
3 o-rings per injector
Small at the top
Grooved in the middle (lower them the upper)
Fat at the bottom.
Pics of what you have would help.
Regarding injector physical size.
Light blue and pinks fit the 02-05 rails perfect providing nobody bent the fuel rails during removal.
I believe the 06 and up top feed Dark blues are slightly shorter in length.