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Thanks:-), the heaters were found on www.aliexpress.com:
https://www.aliexpress.com/item/Silicone-Heating-Pad-Heater-220V-600W-400-400mm-for-3d-printer-heat-bed/32641547360.html?spm=2114.13010608.0.0.vxhHsf

There are tons of different sizes/voltages etc (even can get them custom made)