I was rummaging around my shed today digging out several spare XS650 swinging arms ..I came accross this one (centre in photo) that I took off an XS a couplve of years ago .I hadnt noticed before that it was different to all my others,noticably the solid axle slots(no blocks/bolts & its not been welded shut). Also the angle of the rear shock mounts.
Seen here against two 'normal' arms from a '79 SE & a '77 Roadster.
Seen here against two 'normal' arms from a '79 SE & a '77 Roadster.