Do not know their parts sources-Chinese etc. but I can tell you that their prices are high, and have seen no assurance as to where the parts are from, most likely the same places the others are getting theirs and selling at lower prices.
Heck even these days a good source manufacturer called Rare Parts in Stockton Ca. will not guarantee without asking if the are sourced from china or oversees or they actually made them and they are also Not cheap! A call will tell the source if asked, from personal experience.
Most everyone will suggest looking/online for NOS or at least real NORS.
DJ