This is my story and I'm sticking to it.
These were the injectors in my 91 truck when I bought it. I replaced them when the truck started rough. That is when the question, what is it started. I was think of putting them in my 92 and send those (6X0.009) out for rework, but I didn't know what the oddballs were and didn't want to put them in blind. Now I know and they are being cleaned and reset for use. Then I get to "rework" the 6X0.009 to a 0.010 or 0.011.