Try our re-instated info resource - "Aladdin's Cave" (Main menu)- sorry it's taken so long to fix
They are all the same, I've heard reports that they tend to rock when fitted. You could buy the cheapest and fit the cover onto your base.
You could buy the cheapest and fit the cover onto your base.
Some years back I re-trimmed a 550 K1 seat with a repro cover. I carefully cut the chrome trim moulding from the original seat cover, and glued into place over the new cover once fitted to the old base.