I'm 100% sure they're .250 connectors. Get the insulated ones.
+1
I dug up an old post that I made and I'm re-posting it here since I feel it's more relevant:
The Cherry brand uses .187 connectors. Buy the connectors
hereThe E-Switch brand is slightly bigger and uses .250 connectors. Buy the connectors
hereThe
GGG Microleaf switch (and Sanwa or Seimitsu buttons) uses even smaller .110 connectors! Buy the connectors
hereI've pictured them all below for comparison. The Cherry is on the left, the E-switch on the right and the microleaf on the bottom. It's a shame they changed the size of the connectors on the Cherry vs. E-switch. All of the connectors I own are for the original Cherry switch, which is .187.

DeLuSioNaL29