Dealer local to me seems to stock very little. I have a 2010 4Runner, they had to order pads and rotors, told me they don’t stock themDealers do not stock boutique parts. It is not financially responsible to do so. Typical sales demand that qualifies stocking any particular item is a sale recorded in each of 3 months in a 12 month period. In order to keep the stocking justification it needs to sell at least once every six months thereafter.
That's not likely to happen in the normal dealer environment to items that apply to 30+ year old vehicles.
I was able to do it because I had the customer base that bought enough to generate the sales demand to justify stocking the stuff.