Sideshow just got back to me and there is nothing they can do as they are out of parts for ROTJ Fett.
They said my best bet is to contact Medicom in Japan.
I don't hold much hope for ever getting this part as Medicoms support us in Japanese.
I tried gluing the peg back to the rocket but the super glue I used didn't work even though it was a special plastic adhesive super glue it just formed a rubber like skin and didn't stick the peg back to the rocket.
So annoyed by this but life goes on.
Try their overseas email add [email protected]
So far, a few of my friends including myself, have been getting good support from them in replacing parts.