replacement parts for sterling by musicman jp160

hi everyone, do you know where to buy replacement parts of jp160 like this. the locking nut of my jp160
was broken when i tried to replace its strings, though it is still playable i want to replace it as I am worried for its tuning stability.. and also a trem string block cause one of its block had been crushed or broken.. any help would be great thanks..

ps: i already emailed sterling by musicman and i am still waiting for their reply..

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