Hi Heather, In reference to rollbars and rollcages, adr regs Lk8, Lk9 current regs for new rollbars are 51mm for main hoops, cold rolled seamless pipe. Crossbars and support bars are 30mm, cold rolled seamless pipe. These are the requirements for new rollbars. Earlier bars from mokes can be fitted but you would have to notify your insurance company for agreement, if your moke did not have one originally fitted.