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ARP uses a proprietary alloy from Tech Steel called Custom 450 for their stainless fasteners. As supplied by ARP the tensile strength is 170-190ksi. Galling resistance is good. Stress corrosion cracking resistance is good. Toughness is good. Otherwise, you are correct that the typical 304 and...

Amazon has the stainless ARP starter bolts on sale for $16. I just bought a pair. Otherwise, Leroy has the whole set: https://leroydiesel.com/products/arp-starter-bolts-with-washers-12-point/

Direct drive the motor of the starter is inline with the pinion gear. With the gear reduction starter the motor is offset. Your first picture on this post looks like a 28MT which is a gear reduction starter.

It's direct drive vs gear reduction starters. The 28MT is the gear reduction starter. You'll need the bracket for that one.

If it broke the bolts then it was certainly working. The brackets should be the same regardless of voltage. You can spin the starter off engine. I usually grab the motor lug and starter housing with jumper cables and put my foot on the starter. Make the connection at the battery side, the...

The Delco 28MT is the premium starter for this engine. It's available in both 12 and 24v models.