OK thanks for covering me. I am old and I tend to put all of those "stab" panels in one boat. I also have trouble remembering who bought who.

Good to know they use Siemems. OP can get them anywhere. No luck on seeing anyone on their website say you can use 2 wires on a terminal. I looked at a breaker too. Not on the label.
If there is plenty of room in the panel you could pigtail the conductors coming from the smallest 240 a breaker you have and be legal.

Quote
312.8 Switch and Overcurrent Device Enclosures with
Splices, Taps, and Feed-Through Conductors. The wir-
ing space of enclosures for switches or overcurrent devices
shall be permitted for conductors feeding through, spliced,
70-]82
•
or tapping off to other enclosures, switches, or overcurrent
devices where all of the following conditions are met:
(1) The total of all conductors installed at any cross section
of the wiring space does not exceed 40 percent of the
cross-sectional area of that space.
(2) The total area of all conductors, splices, and taps in-
stalled at any cross section of the wiring space does not
exceed 75 percent of the cross-sectional area of that
space.
...