They should be the ones for it. Weird. Hey when you backed off the adjusters did the hex part come loose and shift? Could be rusted in had that on the dart.
No there was no shift. I gave this K frame to Les Schwab, they rebuilt it entirely. THEN I slobbered POR 15 all over it, looks like ****. Maybe it's gummed up from my high quality paint job : ) Is it safe to grab the hex with a pipe wrench or something softer and try to free it?