Put new brake pads on the original rotors

Good afternoon,

I would suggest either having the rotors resurfaced or replaced. There is a wear pattern from the old pad and the new pads may not contact 100% This video shows the job being done on a similar car but the process is the same.

https://youtu.be/-6lQSA-Em0Y

and

https://www.2carpros.com/articles/how-to-replace-rear-brake-pads-and-rotors

Removal and Installation
WARNING: Clean dust on brake calipers and brake pads with a vacuum dust collector to minimize the hazard of airborne particles or other materials.

CAUTION:

Be careful not to splash brake fluid on painted areas; it may cause paint damage. If brake fluid is splashed on painted areas, wash it away with water immediately.
While removing brake caliper, do not depress brake pedal because piston will pop out.
Do not damage piston boot.
Keep disc brake rotors and brake pads free from brake fluid and grease.
Burnish the brake pads and disc brake rotors mutually contacting surfaces after refinishing or replacing disc brake rotors, after replacing brake pads, or if a soft pedal occurs at very low mileage. Refer to Brake Burnishing.
REMOVAL
Observe brake fluid level in master cylinder reservoir tank. Partially drain brake fluid if necessary.
CAUTION: Do not reuse drained brake fluid.

Remove rear wheel and tire using power tool. Refer to Adjustment.
Remove the upper and lower sliding pin bolts. Refer to Exploded View.
image
NOTE: Note the sliding pin orientation during removal. The upper sliding pin contains a bushing.

Remove brake caliper from torque member. Leaving brake hose attached, reposition the brake caliper aside with wire.
CAUTION: Do not twist or stretch the brake hose.

Remove the brake pads and shims from the torque member.
Remove the brake pad retainers from the torque member.
image
CAUTION:

When removing the brake pad retainers from the torque member, lift in the direction indicated by the arrow as shown so that it does not deform.
Replace brake pad retainers if damage exists.
INSTALLATION
Installation is in the reverse order of removal.
Apply Molykote AS-880N grease or equivalent between the outer brake pad, outer shim cover and outer shim and the inner shim and inner brake pad. Install outer shim, outer shim cover to outer brake pad, and inner shim, inner shim cover to inner brake pad.
CAUTION: Replace brake pad shims and covers if damage exists.

Apply Molykote 7439 grease or equivalent between brake pad retainers and brake pad ends. Install brake pad retainers and brake pads on torque member.
CAUTION:

Make sure the brake pad retainers are fastened properly to the torque member.
Replace brake pad retainers if damage exists.
Using a suitable tool, press the piston into the cylinder bore of the caliper.
Check brake fluid level and refill as necessary. Refer to Inspection.
Burnish contact surface between brake pads and disc brake rotors. Refer to Brake Burnishing. Check out the diagrams (Below). Please let us know what you find.