Did you take a look at the parts diagram?...https://alpha-sports.com/massimo_parts.htm?q=massimo-parts I suppose there may be a unique situation that only a 1 off bolt or screw may work, but everything I see on the parts diagrams are standard metric bolts. They are after all trying to minimize costs, and creating unique hardware hardly seems productive.
Glad you found the bolts/studs/information you need.
May want to share the diameter and thread pitch with the rest of the community. In case someone else needs the info.
Stainless is fun to drill.
Personally, I wouldn't call Ace a good hardware store.