If his US YUNTYH131 was never sold separately, don't know why?All parts of the landing gears are separate available. You can change only what you really need and save money.
Here are product numbers in order of the probability it is broken:
2. YUNTYH110SVC or RakonHeli RHTHYN721-K (=RHTHYN722, RHTYHN723-X and RHTYHN724)
4. YUNTYH119 or RH50QYN725
RakonHeli stuff is sometimes cheaper but looks better (alu instead of plastic).
If you look with a search engine for the product numbers you will find good offers (my experience here in Europe/Germany).
I am in the US and I need the lg and the servos I have nothing !