My floor mats kept coming loose slipping under the pedals of my fiesta and because I'm cheap I decided to design and print my own replacement for the broken original clips. They were designed in 123D based on the measurements of the half a clip I had left and the dimensions of my car.
Should fit other models too but measured to fit my car and mats (2011 Fiesta). Should also fit other ford Models of a similar age including the Kuga, Galaxy and Focus.
Make sure your print is reasonably strong, you don't want these breaking during a drive. Having said that mine have been in the car now for over a year and have not broken.