You’d still be supporting GM indirectly. In oversimplified terms:
If you buy parts from a junkyard, this tells the junkyard that these cars are desirable to purchase for the purpose of parting out, so the junkyard will buy more.
The junkyard buying more junked GM cars will cause increased scarcity of GM cars in the region and prices of GM cars will rise.
GM used car prices rising will enable GM to (eventually) crow about how their cars’ resale values are doing great in a TV ad (as several makes have done for various reasons).
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More directly, many junkyards track what parts get sold from what car. This information is sold to parts manufacturers and GM, who know what parts break often and can plan making more of them to sell in the aftermarket. This, of course, helps sales of parts to those that won’t go to junkyards...
Go to the big box store and get Chinese parts for your GM. That is what I do. I flat out refuse to go to the dealer for ANYTHING on my pre-obama chev van. If I can’t get it from the aftermarket parts store i go to the self serve pick a part. Rarely do they ask what the part came off of. They have flat rate pricing. Normally a part is <15 there. A complete engine is 125 bucks.
I bought it a month or so ago. I am not proud but I had 600 bucks to spend on a van and I needed it with in a week for a new job.
it was the first van to come along that fit the requirements so I bought it.
I don’t plan on keeping the van long. its making me money and I have already started the Ford Econoline/Benz sprinter fund to replace it.