The 660 rear bumper is wider than the 550 by approx 10mm
But where exactly is the extra width on the body? Using the earlier CP21S Vertical handle VIN to compare it’s still unclear where the width comes in.
| CM11V | CP21S Vert | CP21S Hori | |
| Door | 68001-60D30-000 / 60DV0-X06 | 68001-60D30-000 / 60DV0-X06 | 68001-60D60-000 / 60F13-000 |
| Side Panel | 64111-71B00-000 | 64111-71B00-000 | 64111-61D00-000 |
| Roof | 65111-70B00-000 | 65111-70B00-000 | 65111-70B00-000 |
| Rear Bumper | 71811-71B00-26U / 71B00-799 | 71811-61D00-799 | 71811-61D00-799 |
| Rear Bumper Panel | 65410-70B00-000 | 65410-70B00-000 | 65410-70B00-000 |