The Energon Pub

Hello all, a little while back I found the MP Megatron upgrade in a secondhand shop for a decent price so I got it for a friend in the UK that wanted it. Well just now he's opened it up and it seems like the previous owner forgot to swap back out the new grip pieces that have the extra plastic track needed to add the butt in gun mode, so at the moment all he can do is have Megatron with a very long barrel. Would anyone happen to have these grip pieces? I'd even consider buying the whole kit again, but I paid $80 Canadian for it so I don't really want to go higher.