Ribbon Cable clamp question?

Hi

Can someone give me the dimensions of the ribbon cable clamp, I copied the dimensions from the google sketchup model and they were 80mm long by 25 mm deep. No matter how long i look at it, it seems wrong, way too small.

Here us a link to the info required

It’s between 3.5" long and 4" long.

I used the ribbon cable as a guide when I made mine.

http://www.gbfans.com/equipment/reference/33/360/