Are they trying to imply that these parts are Maximum Motorsports - by saying "Maximum"? They certainly look like UPR. I'm a MM dealer and I've never seen those COs, that's for sure. The only thing that LOOKS like it COULD be from Maximum is the lower shock mount:
1979-04 Mustang Lower Shock Mount (use with Coil-Over kit) [MMSM-2] : Maximum Motorsports, the Latemodel Mustang Performance Suspension Leader!