fuel injector inserts

[wa b]

I`m fixin to change out fuel injectors and inserts.  The inserts in the car 
are the light tan with 11, 12, or 13mm(not sure which) allen head fitting.  
Are the inserts threaded?  The inserts I recieved just push in and are not 
threaded.  TIA, just want to be sure I have the right stuff before I start.
  Parts waiting to go in:

  035 133 551F  fuel injectors
  026 133 555A  fuel injector seat-insert-(black)plastic

   Andrew
   `88 80q
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