Do all these codes seem appropriate for a 5513 Sub?

[mat-with-one-t]

Hi all. This is my first post, so be gentle! I'm a long-suffering vintage Seiko fan, but have always kept eyes open for the right Sub!! It turns out, a 1970 5513 has caught my eye. My primary criteria is originality, followed by condition and provenance. The one I'm looking at looks pretty good, and has paperwork showing service work by a reputable dealer.
In my research, most things are looking right, but one small detail has be a bit puzzled regarding the bracelet.

SHOULD END LINKS ONLY BE 580?

Bracelet is 93150
End links are 585
Clasp is 176

I note that it was the Sea Dweller 1665 that was normally supplied with 585 end links, and the Sub should perhaps be 580 only.

Is it still possible that the end links are still original to the bracelet, which is original to the watch?

Down the rabbit hole I go!

All the best,
Mat