here is the data sheet from the mfr:
http://www.tyhhk.com/pdf/HG/HG4230.pdf
Isn't the part HG4230-012-Z1C?
I did some quick looking and I think this data sheet has a direct cross:
http://74.52.232.215/PPDF/833H.PDF
for 0.65 each at mouser or future and you can buy one.
Here is the mfrs website:
http://www.songchuanusa.com it is the 833H series Form 1C. Looks like they are referred to as Sugar cube relays for automotive use. Go to that page and you can look for a distributor by you. Worth a shot.