Tilting ashtray replaced the slider on the later '68s, I've had both - I don't recall all their SPDs, but I'd guess mid-model year.
Wheels could have been Ford Magnums or a swap; most of us modified our cars back then, or the originals were stolen, or were steelies...
Not sure what you mean on the NSS, all of mine have been on the trans - do you mean 2 vs 3 pole switch ?