Which thermal pads can I use for my laptop l502x? +Photo

Hi,

I want to replace my thermal pads for my l502x laptop. The RED one in the photo is the one which is broken and I need to replace it. But I don't know exactly which is the thickness needed (0.5mm, 1mm or 1.5mm). I've searched on the service manual and there is no information about it. 

Also, I don't know which is the diference between the thermal pads marked as RED and the ones marked as GREEN

Thanks