Vintage Connections have the smaller 3.5mm open barrel bullet connectors too,
From their description of the SB-1 3.85mm connector: "Standard size for most 60's to mid-70's Hondas. (Do NOT order for any models of Honda SOHC fours, from 1969 on. Order SB2, below.)
From their description of the SB-2 3.5mm connector: "Standard size for all Honda SOHC fours, 70's Honda turn signals, and Honda 90cc's and mopeds."
The vintage Connections connectors I use (the SB-2) are a perfect fit.