The aluminum piece with "Datsun" embossed in it is called a sill plate.

Those aren't the same as the 280z scuff plates. 280z version is longer with a different shape tapering off the end. I'll take a snapshot of the one i removed tomorrow.

My bad. I just assumed '240Z'.

I took a few photos of the Scuff plate (for reference)

As you can see it's rusted out a bit; I considered grinding the rust off, but concluded it's really not worth it (beyond repair).

Mike, I have access to a 75 280 that may still have those pieces. I pulled the ones off my 76 and they're still good. if I have the 75's, I'd be happy to ship them your way if they're usable. I'll go look this week and let ya know.