Hey stang,
Your best bet would to put either one GBU 12(500lb) or one GBU 10(1000lb) on the 3 & 7 stations.
With the reference material that I have, these GBU's were hung alone on the pylons(Uncovering the Lockheed Martin F-16 A/B/C/D(Daco Publ) and F-16 Lockheed Horizon).
As for the "TER" ( Triple Ejector Rack) and "MER", photos show MK 82 "500lb HDGP, Mk 82 500lb LDGP/ 25lb practice bombs and the like were fitted onto these racks.
Basically just check w/ your references.
Flaps up, Mike
If you would listen to everybody about the inaccuracies, most of the kits on your shelf would not have been built Too Close For Guns, Switching To Finger