How to remove heater control box/blowers?

[Hogger]

The Haynes book is a little vague about the actual removal of these parts.
I've got the fuel tank out, all the ducting hoses are removed, and control cables are loose. I have also removed the bolts from inside the cabin, on the top of the firewall that holds the "boxes" in place.
They are loose, and I can move them a little, but just not quite enough to pop them out.
Do I have to remove the dash so the defrost vents can have more room to move?
Is there something else I'm missing?

[monkeyboy04]

IIRC there are two bolts on the sides too. Those have to come out.

It's a bear to remove. That I remember vividly.

[Hogger]

Got it, thanks.
I missed a couple spring clips on the front and back of the units.