More help please

Could anyone tell me how the back of the heater box mounts to the frame rail. There is an arm that extends down but cannot find any part I removed that seems to be correct. Thanks much

On my S3 it’s a bracket on the frame.
image
one single nut on the underside of the heater box secures it to the bracket.

Sorry, its a 67 series 1

It’s a U bracket as shown here. #6

As seen on TV…

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Love youu gyz, thank you