Alright, so you're working on a classic from the early 80s.

This is the rear left brake caliper you need.

It's a direct fit for the Buick Riviera, Cadillac Eldorado, and Oldsmobile Toronado from 1979 up to 1985.

Also fits the Seville from 1980 to 1985.

This isn't just the caliper; it comes with the bracket and all the mounting hardware, so you're good to go right out of the box.

It's a single-piston caliper made of cast iron, so it's tough and reliable.

The piston itself is steel and measures 2.13 inches in diameter.

It's got the casting numbers 020L on it, which is correct for this side.

The bleeder and inlet ports are both M10x1.5, pretty standard stuff.

It's a brand new unit, not some rebuilt junk, and it comes with a 1-year warranty.

If your old one is leaking or seized, just swap this one on and get that brake system back in shape.

Oh, and heads up for California folks, there's the Prop 65 warning, but that's on pretty much everything these days.