My front seats have a really basic system - originally a couple of chunks or wood with a semicircle routed down the centre which the seat tubes slide forward and back in. They were held in place with a chunk of flat metal bar which tightened with a bolt/wing nut fastened through the floor.
I lowered my seats and replace the wooden runners with chunks of ally channel on smaller wooden blocks (I don't have a router!)
1972 4/4 4 seater, 1981 MGB GT
1984 Harley Davidson Electra Glide, 1990 Kawasaki ZX10
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