1973-74 B-body vs 1973-76 A-body spindle

The Guy on the chat on their website said that the Spindles and the upper control arms are 73-74 B-body.

Just reading the descriptions on the website it’s clear that whoever is writing their descriptions has no blinking clue about Mopars. Or brakes. The fact that they’re selling straight up stock parts at the prices they’re asking is crazy. Clearly their “tech support” guy on their chat isn’t any better. Doesn’t bode well.

I wonder whose 4 piston calipers those actually are, before they get rebranded.