? on DSE mono to multi leaf conversion kit. have a issue

[brownz]

i have a 1970 nova and im using the dse mono to multi leaf conversion kit. when i installed the kit i have a space between the rear end and the upper locating pad, and when i put the car in gear or drive down the road it makes noise and rattles because its loose. what do i need to do to correct this issue? its on both sides. its like the upper pad needs to be thicker?

Thanks
Brandon