This 80 came from a warm climate so it did not have any engine insulation on the firewall that we see commonly in the US. I want to add this to help with noise and heat.
Here is the insulator that I purchased from a dealer in the US. Part number 55223-60112.
It is held in place via 3 x plastic retainers to the firewall which has a stud that they snap on. Well, the stud(s) were not present on my 80 and I assume they were not installed if not optioned with the insulator. A stock US 80 will have the studs on the firewall for these clips. The clips can also be purchased separately: 90467-13035
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