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After removing the original rubber door bushings, fit the replacement delrin units and thread the bolts in by hand and close the door. Open the door note the position of the door bushing before torquing the bolts down.
If the door has difficulty closing or you prefer to alter the fit you may sand some material off the bushing.
Good-Win Racing Staff Notes:
Sean @ GWR: Without a doubt this is one of the quickest modifications I have ever performed and also one of the best. Go over some train tracks or joints on the freeway and you'll immediately feel the chassis absorb the imperfections with reduced noise, vibration and harshness.