the hard points for outboard pylons are already in place on the 'k' wings, it would just need the fuel plumbing to be installed.
Hey, I just spread the rumours - I don't start 'em!
I believe there were also fatigue concerns back then as well - I do know some (all?) of the SF mini-fleet received some new wing sections later...
There was also much misinformation/disinformation about what wings the Ks had then as well...that just means confusion. They weren't all the same then...I do know that much.