Question about Lifter Oil Gallery Plugs

THOSE PLUGS ARE FOR ROCKER SHAFTS. NO PLUGS BEHIND THUST PLATE.
...then why is there only 2 in a freeze plug kit?? If for the rocker shafts, wouldn't you need 4?

This is what mine looked like upon disassembly (not quite as clean, though). It is the original, numbers, never been apart before( according the orig. owner) 273 2 bbl engine. Also had the orig. nylon timing gear and s-t-r-e-t-c-h-e-d timing chain to prove it.