Hi Bill,

The plastic thing with holes is the injector "diffuser" designed to break up
and better atomize the fuel from the injector.  There should be a slight
indentation near the top (end with the big hole where the injectors sits) on
one side.  This indentation should match a similar key in the injector hole
in the block. Take a flash light and peek inside the injector hole in the
block.    Insert the plastic injector diffuser such that the two keys line
up - can be a bit tricky to get it to seat properly. I find sticking my
finger down into the end of the diffuser while it is in the block and
twisting it a bit helps.  It may look like its seated, but when its really
seated its a ways down into the block.

The end with hole stays out - so the injector nose can be inserted.  Made
certain you seat this diffuser (if you are going to use it - not essential
but recommended) properly or else when you try to tighten the bolts which
hold the fuel rail onto the injectors you could break the diffuser or
damaged the plastic cover (over the injector pintel) on the bottom of the
injector.

As best I recall the angled plate of the diffuser should deflect the stream
of fuel toward the intake port (into the combustion chamber), provided you
have the keys lined up.   Then the injector with its "O" ring is inserted.
The nose of the injector should go into the injector diffuser but the "O"
ring should rest on its top.

Hope this helps.

Ed A