LE interior parts are most certainly rare, and ones in good to excellent condition are even rarer.
Since you only ask about certain parts of the interior, I will give my opinion on pricing, bases on my obsession with all things LE, since I have owned 3 of them and sold interior parts from two of them.
Carpet (all 3 pieces) in very good to excellent condition = $200-$250
I paid almost $500 for a brand new, in-the-box, never-been-installed set!
Red seat belts = $50 - $80+
I actually picked up a JDM pair for about $125 plus shipping because it does not have the extra looping like the airbag cars. I changed to a non-airbag steering wheel and wanted to have the correct belts.
Seat belt tower trim pieces = $35 - $60 each, depending on whether or not the snap connector areas are not stressed (causing that white spot on the facing side) and whether they come with that little red square that slides over the rectangle spot right behind where the seat belt goes through.