It's tough, I know all too well. I used to work at a company that makes and sells brake parts, and are the largest supplier of brake parts in the country. Until a few years ago the majority of their parts were made in North America. Especially with older applications, we were the only company making certain parts, all other suppliers would buy certain parts from us with us being the sole source.
Then around 5 years ago, the corporation that owned us started having financial trouble, and sold the company to an investment group, and they started sourcing more and more parts out of Asia. Soon they closed most of the North American plants and started making almost everything out of Asia. I heard a few months ago that the last plant left in the US is being closed in June. They had been making many of the "low volume" parts there still. Well, now with that closing, some of the low volume parts are not going to be sourced out of Asia, just discontinued. So not only do we lose the ability to purchase US made brake parts, but some things we aren't going to be able to buy anymore period!!
I get alot of car guys coming up to me telling me they went to buy parts for their vintage cars and the box said China, and asking where they can get US made parts for their cars. I tell them they aren't available new now, the only way to get US is to find old stock, NOS or NORS.
For newer cars, my understanding is that Performance Friction and Hawk still make brake parts in the US, but for vintage cars we are SOL.