This view shows how I positioned the collar. I tightened the top clamp to the ring that comes out of the cowl first so the new collar was hanging from it. I then reattached the heater box to the firewall, slipping it into the collar. There was just enough room to get a very long screwdriver in to tighten the bottom clamp. It also hides the seam and clamp mechanisms, even though the coupler is hidden under the dash and vey little of it can be seen after installation. Next –––>

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