I had the same issue with a GM kit on Thursday. Both the FAI kit and the GM kit only supply 2 of those bolts, despite 4 being listed (EPC also lists 4). My local GM dealer is speaking to VX to find out what is happening and why the kit has been changed. I'll also speak with FAI on Monday when I'm back.
While I was at VX on Thursday, we opened several balance chain kits, and all of them only had 2 of the bolts.
They are fairly cheap, so if they have adjusted the parts supplied, I can look at supplying an extra 2 with the kits we sell if people would be happier with 4.