they do that on the E30, maybe its just a RHD thing, but i always have issues with them too. they are fine if you have the BMW pins for them still, but usually they are long gone these days. In my current e30 i just drilled a hole in the fabric threaded a piece of rope through the hole and then around the front right seat bolt to the chassis, never slips anymore. unorthodox but it works.
I took my carpet out and used carpet shampoo and a piece of 3mm mdf about 6 inches long to get all the dirt moving. Then the garden hose to flush it clean. Two goes and the carpet came up very well indeed. Took two days to dry in the sun.
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