I use this one on my 2.4L: https://www.amazon.com/gp/product/B006ENE7A6/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
This work?
Zerostart 3100129 Engine Block Cartridge Style Heater for Chevrolet, Lexus, Pontiac, Scion, Toyota | CSA Approved | 120 Volts | 400 Watts https://www.amazon.com/dp/B006ENE7A6/ref=cm_sw_r_cp_api_glt_fabc_BVEE7H4T7MSRP5ZG0PYK