I'll tell you what they worth:
I've checked: Cheapest I found for the two-part injection mold for the left here in SH (small shop price) is $3000 and the right is $500. Min order is 500pcs each which is dead cheap anyway but regardless, add x1,000 rubbers and the order is minimum $6,500. So....
Anyone who are going to get these "unique" rubber for <$6,499 is a winner