heated seats 2023 tundra

has any one used this style of heated seats it says not to cut so im assuming u just push it into the grooves, put the bar over the heater re insert the ring clips back in through the holes to hold the bar down.

Toyota specific version
https://www.voxxelectronics.com/ADAS/seat-heaters/?sku=SHTOY

based on the instructions the pads look like this
https://www.voxxelectronics.com/ADAS/seat-heaters/?sku=SHSB2


i have installed the white pad version before in my jeep but it felt like i had paper under the seat cover

also i was thinking of changing the fabric to leather or just leather fitted seat covers

would rather install the factory parts but don't think there's wiring for it and cant find the parts
thanks,