72V 1500W High-Speed Brushless Motor Electric Differential Axle Motor| 4800RPM for 4 Wheelers Go Kart Trikes, Tricycles, Lawn Mowers, ATVs, Quad, Golf Carts

You can get them from Amazon or eBay. Price gone up a bit. https://www.amazon.com/Kemblawolf-High-Speed-Brushless-Differential-Tricycles/dp/B0DPG7YDTT/ref=pd_aw_subss_hxwPER_sspa_mw_detail_m_sccl_1_2/141-6544600-0001227?pd_rd_r=8d373553-4349-4646-8e50-4c0c311bdf4d&pd_rd_wg=41gj7&pd_rd_w=yiokg&pd_rd_i=B0DPG7YDTT&psc=1&sp_csd=d2lkZ2V0TmFtZT1zcF9waG9uZV9kZXRhaWxfdGhlbWF0aWM=