firewall heater delete panels

[hpcgmc]

I'm going to cover the heater holes in my firewall. With some guidance from this site, I've found two different types of covers. One type just covers the holes themselves. It looks like you weld them into the existing holes. Here's the ebay link: http://www.ebay.com/itm/67-72-chevy-...item23411680a4

The other type is a big sheet that fits over the whole panel, including the holes. Here is an aluminum one on ebay: http://www.ebay.com/itm/67-72-CHEVY-...de94b6&vxp=mtr

I think Vintage Air has a plate as well. What have people used that they liked and disliked? I've got a welder repairing the rust in the floorboards and I'll be talking to him this week about smoothing the firewall.

Thanks!