It turns out that Steve's kit has two of the pieces which are second from the right most piece in the pic above. One is rubber and one is a hard plastic. I used the plastic one. I could substitute the plastic with the rubber one.
I also see now that the point tip I bought for my antenna is larger than the original. Bummer. I bought that one off of eBay. I will have to replace it at some point - I don't like that it is too big.
I got another thing out of the way today that I was dreading doing: gluing the jute to the tunnel, and gluing the original vinyl to that. I realized when reviewing some pictures that the tunnel jute and vinyl go into the car before the firewall padding. Since I already installed the firewall padding, I had to pull it up at the bottom edges to get the jute and vinyl tucked under. It wasn't too difficult to left up the fire wall padding a bit.
I poured contact adhesive into the spray gun, and I was off and running. I temporarily fit the jute and marked a few places at the top center with a paint pen so I knew where to place it after spraying both the backside of the jute and the tunnel with adhesive.
I think I ended up with good placement:
After gluing in the rear jute section, I glued the front section in place. Then, I retrieved the original vinyl trim for the tunnel. To start, I sprayed glue only on an small area at the top edge of the tunnel and the vinyl (third pic):
I had the fiberglass center console available for this part of the process because there were impressions made by contact of the console in the original vinyl. I used those to determine where to locate the vinyl vertically on the tunnel (third pic shows some of the impression). After I got the top part of the vinyl glued in place, I rolled the vinyl upwards to expose the side portion of the jute. Then I sprayed that and the rest of the vinyl with adhesive. The vertical location was already set, so all that remained to do was to roll the vinyl downwards over the sides of the tunnel and press down firmly everywhere.
At the rear of the tunnel (second pic), the vinyl rolls up against the rear face a touch.
As far as I can tell, the vinyl appears to be in the correct position everywhere. Hopefully that is the case. With the tunnel jute and vinyl in place, I now can install several items including the heater core, the fan, the steering column, and the dashboard.