Sandcast only, No one has said the S word yet. I assume you know 9 bolts is rare and indicate a sandcast engine? They are hard to find. A 10 bolt cover will fit but of course isn't correct for a restoration.
Even if you find a replacement, it's worth fixing. A friend had an Inline 4 Indian engine repaired where a rod exited in the 60's. You can't tell by looking at the outside. If the microwelding doesn't work out I can get his number, not cheap but worthwhile.