Here's a recent one-
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Factory master cylinder on the left, new Cardone replacement (same one everybody rebrands and sells) on the right for '73 and up A body power front disc brakes (15/16" bore).
What's wrong with this picture? This goes in the category of "Fits. Might work (it doesn't). Ain't right".
Looks like a Ford master, but with the Mopar four-bolt mount.
How do I know it's the same that everyone else sells? Because what are the chances EVERYBODY (Raybestos, Napa, Centric, et al) would redesign the same master cylinder in the same way at the same time? I know, it's the internals that matter. But are the internals the same as original? Do the rebuild kits apply to the factory master or the aftermarket master? I guess I'll find out, Because I've got another Napa rebuild kit ordered, since the "new" master (after being properly bench bled) puts out almost zero pressure- I can hold the ports closed with my fingers while pushing the piston. At 64 YO I can still piss with more force than that.
I'll give you three guesses which one gets rebuilt and which one goes on the scrap pile.