The Lotus Grand Tourers

The car mat fittings that stop the front mats sliding around are broken. These are the little black plastic 'D' things that slip through the mat and then you turn them through 90 degrees to make them lock.
The car mats that just sold on e-bay for £62 + £10 p&P included fittings, but I thought £72 was a bit much!
Does anyone have any ideas where I can get some new fittings, or something else that will stop the mats sliding forward when I get in?

Thanks.

Mine are attached under the seat with velcro - seems to have been a factory "upgrade" in later models ?

Thanks - I'll give it a go.