Rockstar Headset Specifications and aftermarket options.

[DeMedici]

The RS headset type is called semi itegrated or zero stack.

Head Tube ID
Top - 44mm
Bottom -56mm
Bearing DIM.
Top 41x30x6.5
Bottom 52x40x8

Aftermarket Headset.
Cane Creek ZS44/ZS56 https://www.amazon.com/dp/B08JS1LCWZ?ref_=cm_sw_r_cp_ud_dp_GEHRF45M6WM3JMSY9SHZ

Tools for the job.
Park Tool Bicycle Headset Cup Remover RT-2 https://www.amazon.com/dp/B000VY1QFI?ref_=cm_sw_r_cp_ud_dp_K7KFQCGYS0MTZ7QK68C6
BIKEHAND Bike Bicycle Headset Cups & Bottom Bracket Bearing Press Fit BB Install Tool https://www.amazon.com/dp/B00BW4TRR0?ref_=cm_sw_r_cp_ud_dp_CSPK5EA5ERX6DJD55WFY
1.5" Schedule 40 PVC Pipe at least 2'-0" (for seating the crown race.)
Large rubber hammer
Assembly grease