I bought one at my Lotus dealer a few years ago. At that time I think the price was around $60 each.Mine too! I am wondering if they are available from Lotus or if some one has made clever copies.
I am guessing that they get misplaced.
Will you send some photos when you get the parts. I too am missing the covers and was just getting ready to make some...but would much rather purchase them it the look good.