I've got a pair of X1/F60 front brakes waiting to be cleaned up, painted, and installed on my F56 S; i.e. the budget BBK already outlined in other posts. I was looking at the Tarox site and they mentioned having a rear brake kit with a bigger rotor. It got me thinking. Is there also a budget equivalent? Would the X1/F60 rear brakes work in a F56? If not, maybe a similar hack is available. Thoughts?