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I have a friend that is making a 4L60E plug kit. He is looking for any interest and what $$ range. He is also finishing a 4L80E & 6L80 kit. He is using a 3D printer and say's he has an arrangement of colors.
TSR Racing Products sales a kit for a powerglide for $17.45, but it doesn't look to be as nice as these. 99% of the time I pull a unit rebuild it and then reinstall, so I don't think I would have much need for something like that. They do look good though.
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4L60E plug kit 
