SRAM XX/XX SL Eagle T-Type Power Meter Battery Lid and Cover - D1 MFPN=11.4018.063.000 and the ratchet wheel is

and the ratchet wheel is generally used on the rear wheel

Brake Caliper Type Post Mount Brake Position Front or Rear Color Silver Defined Color Silver Hydraulic Fluid Type DOT Hydraulic Hose Length Not Included Pad Compound Sintered Rotor Included No keyword search DB-CODE-ULT-C1

This one is a monster

confidence inspiring ride for the end user

Anodized red

SRAM XX/XX SL Eagle T-Type Power Meter Battery Lid and Cover - D1 MFPN=11.4018.063.000 and the ratchet wheel isSRAM XX XX SL Eagle T Type Power Meter Battery Lid and Cover D1. Replacement battery lid and cover for SRAM XX XX SL Power Meter spiderIncludes washer o ring and spring (In addition to battery lid and cover) Compatible with: FC XX P D1 FC XX SLP D1 TECH SPECS Color Black