You may be able to make it from a thin piece of metal than spray paint it with metallic paint. use the other one for the curve shape.

It seems like it was an optional trim piece as a couple 68 owners I've contacted don't have this trim on their cars.

68 427 wrote:

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NOT ALL '68'S WILL HAVE THEM, IT WAS AN OPTION. MY GRANDE PARISIENNE HAS THEM AND WERE LISTED ON THE GM DOCS., MY PARISIENNE DID NOT.

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 Just curious, what are they called on your GM docs?  

Was at Flatla Auto Wrecking today but struck out when looking for another guard. I checked out the 68 Safari Estate wagon and Grande Parisienne, but neither was equipped with this option. He then told me of a 68 Laurentian, and while I found it's valance in the rear seat, it too didn't have this elusive option. Bummer.

I'm pretty sure that my 68 Catalina did not have these trims but I still have the front valence. I'll be going to the storage garage this coming week  I will check to verify if I have the part, and will let you know. 

I checked my valence; I do not have it. 

To those that know me, this won't come as much of a surprise.   I'm like a dog with a bone, as I don't give up very easily.

After calling a number of junk-yards and many other places, I found an NOS set in Iowa.    Then, to top things off, I found another NOS set in California.      

While I had the part number, I finally pulled the single that I had off the valance and checked the number stamped into it.   As is often the case with the chrome pieces, it didn't match the part #.  The casting # really helped me.

So, here's a set that's on its way to me.   It includes the mounting hardware that's missing in the photo:

And here's another set in California.   It doesn't have any mounting hardware:  

I was really just hoping to locate a decent used one, but I came up empty.

Canadian Poncho wrote:

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Nice! Are you restoring a 68?

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 No, I'm just doing some wall art.   I have a 68 Grande Parisienne hide-away headlight bumper & valance, a 69 Parisienne bumper & valance, and a 70 Parisienne bumper & valance.   Signal lights and license plates included too.   I'll hang them on the wall of my garage one of these days.

The 68 valance I got only had one of the license plate guards, I had no idea how difficult it would be to make it a pair.