I think the LE stocks are the best looking stocks there are, I'd love to have had one that worked, the pin and paddle were missing from mine too, but I managed to sell the gun on without those parts.
I was trying to find a pin and paddle set for ages but you just can't buy them on their own.
As Kinnerley has said, and I think I said it as well in another post, but you're better off just buying a whole new stock. So long as you get one that's actually labelled as being for the M4 that you have, there ought to be no problems.