There is no reason to replace the rear caliper, and yes you can turn around and
eBay the extra pieces...
So far my Hayabusa master cylinder is up to $65 on
eBay, so that means:
$100 -- Cost of Hayabusa Calipers & Master Cylinder shipped
- $65+ --
eBay auction hasn't closed yet, sale of Master Cylinder I didn't use
$35 (or less) for new 6 piston front calipers! Kinda reminds me of when I got a Corbin backrest and $40 bucks in my pocket.....
You can see them
HERE