I’m intrigued by this one as I wanted to change my older square block type (pre 2006/7) to the new style. Contacted MR to buy a new pair but was told they are not interchangeable, "no can do". As far as I can gather the tubes are a similar size. They appear do have varying degrees of crushing to facilitate a tight fit. However the older version headrest rests on top of the seats, were as the newer style headrests appear to sit a little above the seats. So something subtle with the seat design between age of cars maybe?. Never quite got to the bottom of what the difference was.
Anyway to cut through all of this I’m in the process of fabricating my own (another slow time project!) I’ve purchased a quantity of thick walled oval tube of the correct dimensions and plan to construct the foamed body of the headrest. Hopefully then have them professionally upholstered.
