Getting ready to rebuild the wiring harness out of this RT3 I've been working on lately. In order to change out the sleeving I'll need to put on new connectors. Vintage Connections lists 4mm as mid 1970 and 3.5 mm bullets as late 1970 Japanese bikes. Can anyone verify which size would have been used in 1973? Seems the 4mm is what they say fits but thought it would be best to make double sure. 

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I have been using 3.9mm bullet connectors, which seem to mate up perfectly with stock Yamaha connectors

Forum member DEET makes complete harnesses with new wire, sheathing and components.

I’ve seen his work and he is truly an artist. I actually like fussing with wiring but I only just learned recently there may be different sized bullets. I bought the sheathing from him last year and he’s creating a duplicate frame very decal for me. Good suggestion though. Thank you!

The 3.9mm (sometimes referred to as 4mm) are what I use.

From my limited experience of working on other makes of bike, the early Hondas use the 3.5mm.

DEET told me 4mm several months ago, and they attach to the existing connectors just fine.