I just bought 2 new back up lamp sockets from Rick's First Generation to replace my factory sockets which were rusted and broken. I have the new ones wired (single filament) but the socket will not lock in place in the tail light housing. Any body else had this problem? If so, how do you or can you fix it? Could it possibly be wrong sockets (they look almost just like the old ones)? Any help would be greatly appreciated, thanks.