Naw, murrays is a walk in store. Their website blows. But locally they tend to have better stuff in stock than the autozones around.
on a side note... I looked up 79 pickup brake caliper and 87 1ton dually brake caliper on autozone website. The part number came up the same. C8613 for driver side and C8612 for passenger side. Id be willing to bet that most yota parts between those years are going to be the same.
Back then foreign makers built vehicles that worked, and if they worked, they left them alone. Unlike domestics, who build vehicles just so they can sell another one in a few years