i'm sure someone has done replicas of them, possibly even Gibson. i think they were only used from about 1970-'72, so there weren't a huge number on original guitars. i have seen them for sale on ebay too, seems to depend which way the wind's blowing whether you get a bargain or not. although anything gibson or especially fender from the '70s is getting pretty expensive.
nice guitar the way it is, i personally don't like the embossed covers and think they would ruin it! :)