Paul,
Here are a couple of pictures of different trims rings available in Oz.
HR Premier Dress Rims. Chromium plated mild steel. There is another version made from aluminium. These would not fit the FE wheels but would fit your Ute's wheels.
Karinna Dress Rims. Made by (or sold by) Karinna, pressed from aluminium. These come in different sizes to suit different offsets. As with most dress rims, the side (part that fits against the rim band) is what varies. You want to find ones with something approaching 1" depth.
I call these basket dress rims. There might be a better name. As per the Karinnas, they come in different sizes (depths) to suit different offsets. The one pictures suits FE to EH rims. The HD/HR/Cortina/Falcon version looks a little different in that the basket section is wider whilst the side is shallower.
EH Premier Dress Rims. Pressed aluminium (I think).
It may pay you to take the spare from both the Ute and the sedan, with a hubcap, to try them out for fit. The shallower offset version will not fit the FE's wheels without a lot of bother as the offset is different. I've got a pair of the basket type, shallow offset, that were forced by a previous owner onto FE-EH rims. As a result, they have splits & tears. I've got a set of the same in the deeper offset, as said above, they do look a little different, which fit poifectly.
Cheers
Brett