The only ones I can find are these little tiny teeny ones on my current avatar My ears are 2 inches. Is there an item that I'm missing? :o
While I'm at it, I need a dreadlock wig that is extremely long like to knees long.
Unfortunately you might have to get a commission a custom item for anything near what you're looking for. As far as I know, of items that are not custom, the largest ear item that's big is this.
However I don't think it is what you're needing.
Alternatively, the wardrobe does give you the tools to see every item on the site even if you don't own it and narrow the search down by layer category. You can always try looking through all the ear items that way.
As well as looking on Subetalodge.
And these are the two longest dreads I suppose I can find on my own. Without too deep of a search through all the hair on sight.
and

i can't help with the gauges but i can help a little bit with the dreads i know there is the longdreads style in the salon that's knee length, but they're tied back. as for other salon dread styles, there's &
there's [item=Torn Hair Magazine Page: Jules] also, but those are in a ponytail and not recolorable. these are also sort of tied back
there could be cw styles too, but i'm not a cw user myself, so i couldn't tell you for sure! maybe have a look around the wardrobe