OS manual mirrors for what?

i have 7 DSide manual mirrors,all with the pentastar
1] 3454119
2]3548753 have 6 of em,same bases but 2 have different hole patterns,any help?

One clue that may help....
If the mounting bases are somewhat flat, then the mirrors are likely to be PRE 1971. The older cars had a sort of "shelf" along the tops of the fenders, doors and quarters. These areas were rounded off in the POST 71 B bodies, ALL E bodies and The 70 and later C body cars. The later cars used mirrors with a much more angled mounting base.

Are those the part numbers,or the casting numbers?

Looks like 71-74 E/B body mirrors. There was a mounting width change somewhere during that timeline.