Armored cars are tricky. I have some from HBG. If I remember correctly, the examples from Risk 2042 are small, but you may find them suitable.
The reason I say “tricky” is that, once you get past the WW1 era, armored cars don’t comprise enough of an independent fighting arm to justify appearing on most A&A maps. A&A simulates corps- and army-level maneuver. Occasionally, single-division corps, such as British and ANZAC units in the Indian Ocean and Southeast Asia.
I used special rules that reflect the use of armored cars in a scouting role. They allow the attacker to re-roll one die during combat so long as they are present in the attacking or defending force. Up to three armored cars can be used in this manner during a single combat phase.
During the WW1 era, machine guns, artillery, and armored cars are significant enough to merit inclusion, I think, because there might be very few even at a divisional level.