21. GRSP resumed discussion on two revised proposals tabled by the expert from Germany. He introduced ECE/TRANS/WP.29/GRSP/2023/4 to ensure that only safe head restraints would be fitted on seats in any seating position in all vehicle categories. Then he introduced ECE/TRANS/WP.29/GRSP/2023/5 that covers the same provisions of ECE/TRANS/WP.29/GRSP/2023/4 with additional new requirements in a new series of amendments. GRSP adopted ECE/TRANS/WP.29/GRSP/2023/4 not amended, and ECE/TRANS/WP.29/GRSP/2023/5 as amended by annex IV to the session report. The secretariat was requested to submit the proposals for consideration and vote at the November 2023 sessions of WP.29 and AC.1. as: (a) draft Supplement 1 to the 10 series of amendments (ECE/TRANS/WP.29/GRSP/2023/4) and (b) draft 11 Series of Amendments (ECE/TRANS/WP.29/GRSP/2023/5) to UN Regulation No. 17.