Older 4/4's and Plus 4's with bench seats had inflatable bladders inside the seat cushions. These have been unobtainable for years and many people have tried to replicate them or provide alternatives without much success.
There's one currently relisted on eBay today, unused original, at £1.99 starting price.
Must have bargain for someone? No connection etc. just trying to help fellow TM members............
