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You are correct.  Stainless steel.  They changed in 70 to aluminum.  Just shows you can't assume anything in this hobby.

The original trim was aluminum with Bright-Dip anodizing.  Very few shops will do the Bright-Dip for hobbyists.  As always, it depends on how much you want it to look original and how much you want to pay.  Some try to polish and then clear coat it.  The results are nice, but not original looking IMO.  Dennis Barnett Classic Molding Restoration did mine but not sure he still does it.  Be prepared for $$ and over a year wait time.

See a part number on it anywhere?  Seems like if GM, it would have a part number

Thanks for the reply.
I think the problem is it is on a corner right where the trunk floor pan bends up to the sides.  The flexible rubber tape on the back is sticking well enough, but is flexing a little and so the tear opens up a bit.  The tear itself needs to be bonded together and I'm not sure what kind of glue or bonding system to use  I'm tempted to use some type of heat but don't want to make a melted mess of things.  i would of course like to make it as invisible of a repair as possible.

Just wondering if anyone has a good way to glue-weld a tear in an original trunk mat?  I have reinforced the back of it with the Flex-Seal rubber tape which does stick well, but the crack is still pulls open a bit.

I know they never came with a jam nut BUT...
Chevrolet discontinued the Chrome Ball very early as I tried to get one in the early '80's and they were already discontinued by then.  The last iteration they sold was a crappy black plastic version smaller than the original and they looked like they belonged on a kids toy.  The repro looks pretty  good but the threads are no way as good as GM.  You need the lock nut just to keep it screwed on.

Buy a 68 version and tap it out to the 69's 3/8 thread.  A good sharp tap will make it fit nice.

1154 guest on right now.. I had to reload 3 times to get to post. Server must be taking a whoopin as of late.

I wonder of these numbers aren't on the rise due to all the AI bots scavenging posts to update their large language model engines.

The Delfleet Essential can also be flatted with the DX-10-FLT flattener.  A good start is 6:1:!:3 paint:hardener:activator:flattener

Just throwing this out there, what about a drop of Locktite, ?

Blue yes.  Red no.

Lynn, that's the set up I currently have , a repo battery, but it only had a 400 cca battery inside (surprised it had enough power to crank it over when it was cold out) but I'm on the fence as I'd like to have a battery with 700 to 800 cca's. Does the Braille battery have enough power. I read the specs and they advertised 550 cca

This Braille battery seems to have enough oats:
https://shopbraille.com/collections/motorcycles/products/braille-green-lite-g30h-lithium-battery

and still fit in the repro battery case.

a bit pricey though

Doesn't the 2 in the 328 look like a re-strike?

Yes, it is.  Well, it is at where I work.  We use it for prototypes for customer parts.  Very handy, but you have to create a CAD file first.  It is a CNC xacto knife.  The table has a large vacuum pump that holds the sheet in place.

I've done a few of the dividers for 1970 Camaros and ran into the same material supply issue.  The 70 divider is about 0.093 inch thick so I laminate a 0.060 and 0.031 sheet together.  I found the material here:
https://www.dickblick.com/products/utrecht-chipboard/?Size=29%22%20x%2046%22&

cutting it:
https://youtu.be/XY2jNbW_nU4

70Z with 3.73 got the .8241 3950352
4.10 got the .7333 3932220
http://www.gmpartswiki.com/getpage?pageid=12662

I am convinced that when a phrase can be manipulated or otherwise bastardized to profit the seller, it will.  "Numbers Matching" at one time was somewhat of a gold standard to mean it left the factory with it.  It seems that now it means the numbers match the numbers, nothing more.  I'm not sure how "born with" can mean anything other than what it says, but I bet that will (if it hasn't already) be twisted to mean that that part has the metal it was born with or something more ludicrous.  I'm waiting for it to get to a court of law to see the outcome.