Proposal to insert a new para. 0 introducing supplements 4 and 5 to the 04 series of amendments extending the Regulation to vehicles of categories X and Y, amend para. 1 to modify scope provisions and add R-point clarifications for category X vehicles, amend para. 2.8 to revise the bonnet rear reference line definition including provisions for category Y vehicles without windscreens, amend para. 2.22 to clarify front structure definition for categories X and Y, amend para. 2.29 to specify occupant mass placement for categories X and Y, amend para. 2.32 to define side reference line for category Y vehicles, amend para. 2.44 to redefine windscreen test area for category Y vehicles, and amend para. 2.45 to adjust cowl monitoring area for category Y vehicles.