Yea I have that one.
Its fiberglass and you have to drill mounting holes and for the blower motor, so just be careful to not crack or scratch the fibreglass.

Fit wasn't great. The delete box is flat, but my firewall had a slight curvature at the top where it starts to transition to the horizontal. It left about a 3/8" gap that I filled with a plastic wedge, then black RTV'd around the whole thing to make it air tight.

I took the relay and resisters off the top of the old suitcase and put them inside behind the dash, on top of the heater core box. Did that to keep the original wire harness in one piece and have speed control for the blower motor on the dash control.

Its great for room in the engine compartment and makes changing plugs a heck of a lot easier !