Alright, so you need rear brake calipers for your Infiniti or Nissan?
We've got a full set here—both left and right sides, so that's the driver and passenger rear.

They come complete with the mounting brackets and hardware, which is super handy.
These are a direct fit for a 2002-2004 Infiniti I35, a 2001 Infiniti I30, and a 2001-2003 Nissan Maxima.
They use a metal piston, just like the original.
They're new, unbranded parts, but they match the OEM specs and come with a 1-year warranty.
The manufacturer part numbers cross-reference to 440014U003, 440014U004, and 440014U010, and they supersede a bunch of others like 440114U00.

They also interchange with part numbers 19-B2857 and 19-B2856.

Basically, if your old calipers are seized or leaking, this is the straightforward fix.
Everything you need is in the box, ready to bolt on.
Quick note: there's a California Prop 65 warning, which is standard for this kind of thing.

So yeah, grab this pair and get your braking system back in top shape.

Simple.