There are screw-in studs mounted in the rear bank exhaust manifold.
There are press-in studs mounted in the Y-Pipe flange for the front exhaust manifold.
There are 2 or 3 (depending on flange) press-in studs mounted into the flange on the converter itself.
So actually you broke 2 of each.
You can probably find replacement screw-in studs as close as you local ACE / Westlake hardware store.
They are M10x1.50 & are offset. 20mm thread/10mm shank/45mm thread
The converter studs can just be pounded out and replaced with: 1 bolt, 1 nut, 2 large washers & 1 lock washer. (found at said hardware store)