Hamza Iqbal, 20, Rehan Khan, 19, Judex Atshatshi, and Saif Ali, both aged 18, pleaded guilty to a charge of destroying or damaging property being reckless whether life would be endangered.
The attack, which took place in the early hours of 23 March, saw four vehicles operated by the charity Hatzola set alight in Golders Green.
Prosecutors had said they believed the incident was a targeted attack against the Jewish community.
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