I spoke to a Wilwood sales rep about those calipers. He said they sell some for Mazda MX5s, but the handbrake mechanism is weak and it's really just a way to meet regs that require a handbrake. He recommended a separate handbrake caliper (MC4), but it seems that would require a thicker, ventilated, disc and it would be challenging (or impossible) to fit it all in. I'd be interested to hear if anybody has experience using them for the handbrake on a Europa.