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Finally installed these on my Replicator 1 after having the vitamins (metal parts) sitting on my nightstand for a few months.  
I used the same parts drandolph listed.Super easy to print, surprisingly easy to build+install!Thanks Emmett and whosawhatsits for creating the models.My only critique is that it is more challenging to load filament. It doesn't seem to guide the filament into the hotend as well as the stock MBI delrin plunger component.  Not a huge deal, and perhaps more usage with it will help me get a 'feel' for when the filament is properly aligned to the hotend nozzle.