Under tank insulation

Need to install missing under tank insulation due to 37°C temps and vapour lock. Anyone got a template of the foil insulation and any recommendations on best foil to use?
How is it attached to the tank - self adhesive backing?

I still have mine, but it has started to disintegrate. This is what I am using.

Hi Ralph,
Thanks for the reply. If you have the old one off can you let me know how it was glued on?