a 23 yr old car i didnt like the seat as it had obviuosly over time and bodies , sagged so i looked at leather ( not good enough condition and prob with the same issue or change them for say gt86 etc , but i love the seats lumbar , bolster adjust etc so i decided to remove the drivers seat and see what i could do.tools
14 mm socket
flat and philipps driver
small pry bar
long nose and standard mole grips
stanley blade or sciccors
and a seat foam from a garden chair
(dont tell the wife )
first remove seat
...14 mm socket , dont forget to remove the boot fuel release unit.... 1 flat head under the boot release pulls and a philips that holds it to the floor (seat ) mount then place on a work bench
starting at the front there are 3 brass rings that need to be prized open and kept for replacing ...
then with the mole grips flatten out the 2 corners of the
large metal pad held by the 4 x spings to ease the springs off on 1 side so you can put the foam under 
then cut the foam pad to size and slide under the remaining metal pad with the seat pad warning connector on
, all the way to the front of the seat .. then with any remaing off cuts ( i had 2 long lenths...) i put these under the spring pad (at the rear ) to keep the rear of the sqaub up as well .. 
then
reverse of removal .. dont foget when you bent the 3 brass rings to secure the front of the squab to the seat frame , you have replaced , to turn them around () into the foam section..as if a later date you loose a pound and rumage under your seat you wont cut yourself couse these are bloody sharp!!!! seat is now prob firmer than it was when new and it cost pennies
....
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