The good news is the plastic jack pn. 42743995 shows as discontinued on the GM parts site. Maybe that means GM realized what junk they are and scraped them.Thanks for posting the up close pics of the plastic jack. That design is questionable.
FYI, I ordered the pn.42743996 jack from the GM parts site. When I receive it I’ll post if it’s plastic or metal.
I did find this inexpensive metal jack on Amazon that has a head designed for jacking pinch welds for only $25.99. It looks pretty much like the same size as the Chevy jack and could make a viable replacement:
Scissor Car Jack