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Hi 3EN1 is a later version of the 1WG - still a 1WG but with a revised frame and specs. Pretty much any Yamaha dealer outside of the US could get you the bits you need. Have you tried to see if bits from an FZR600 (pre delta box swingarm) will fit. As Yamaha do parts bin engineering I'd bet you can ...

Hi your swingarm is for a 3EN1 FZR400 (around 89 model) 3EN2 changed to Deltabox style.

cheers

GTR