for that price, i'd be thinking its cheaparse chinese crap. I've been down that track before, thinking i'd get some real flash looking m/cyls and levers for the Vmax, when I tried to fit them , they wouldn't bleed up for ages and as soon as I got any pressure on the brake it stripped the pushrod actuator which, if i'd been on the road, would have been a serious situation, to put it mildly.
keep looking round the wreckers for maybe something similar but genuine jap parts, possibly off a smaller capacity bike that had smaller brakes but still had clip-ons like one of the cbr250's, vfr400 etc
the prob you'll have with a m/cyl off a bigger bike is that with a larger capacity m/cyl pushing on a small piston brake is it will feel quite soft, it'll still work, just feel horrible. if you go the other way and use a small capacity m/cyl on bigger brakes it will be rock hard but you get less force and therefore less braking effect (which is what I did after the above experiment, I had GSXR 4 piston calipers with the stock Vmax m/cyl and it felt great, just didn't work as well as I wanted, I now have 'busa 6 piston calipers and m/cyl as a matched set and it works way better than the front tyre can handle...)