Do you have the plastic tray back front seats or later, all vinyl backs? The commonly available retrim kits are for the later style, but can be made to work well on the earlier seats, but it takes work.
I hear the earlier style kits are still available in the UK...but heard this after I had heard otherwise and done my seats...
'85 90 2.5NA
'72 SIII 88"
Couple other cars