The standard Thunderace rear caliper is not a bluespot, I know this 'cos I have one fitted on my own bike ... see picture of it in link about a quarter of the way down the 2nd webpage:
http://foc-u.co.uk/index.php/topic,8167.25.html
But the T'ace caliper fits onto a TRX850 bracket, not the standard FZS600 bracket.
That looks like the rear caliper off an early R1 (1998-99 4xv model). Are the caliper's mounting holes about 82mm apart centre-to-centre? Sadly if that's the case it won't fit, and the R1 mounting bracket fits the swingarm & has no mounting point for a torque arm.
Bluespot rears from early 2001-05 Fazer 1000's and XJR1300s (can't remember which years) are the only ones where the mounting point holes definitely match the standard FZS600 mounting plate holes.
http://foc-u.co.uk/index.php/topic,8167.25.html
But the T'ace caliper fits onto a TRX850 bracket, not the standard FZS600 bracket.
That looks like the rear caliper off an early R1 (1998-99 4xv model). Are the caliper's mounting holes about 82mm apart centre-to-centre? Sadly if that's the case it won't fit, and the R1 mounting bracket fits the swingarm & has no mounting point for a torque arm.
Bluespot rears from early 2001-05 Fazer 1000's and XJR1300s (can't remember which years) are the only ones where the mounting point holes definitely match the standard FZS600 mounting plate holes.