How would the legal situation be with adding these after market?

As far as i am aware compliance was only issued for 7 seater D2s where self leveling air suspension was fitted at the rear too.

Had wondered about looking for a set of these for myself but with no SLS on mine I wondered about potential legal problems later.

Cheers

Al

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2003 Range Rover Vogue 4.4 (The wheeled sofa)
1999 Discovery 2 v8 (The off road toy)
1998 TVR Chimaera (The pampered toy)
1977 BMW 633 CSi (The project)