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the 001 was for basic display only and was soon dropped - buy 002 they say.
003 was for newer models than the 002 - both had issues with MP3 players.
004 and 005 are the current models 005 as three row top plug, 004 has two row.
And the difference between the units was as simple as changing the lead. Mine was a 004 bought as a 005 (seller didn't know) got a new lead from Connects2 for £10 to convert to 005
Bit more info after getting hold of the Soundlix Tech people they have confirmed that the display adaptors DONOT work with the following head units:- CCRT700, NCDR1100 and NCDR1500.
The steering wheel controls work fine but it isnt compatable with the GID, hence why im having trouble with mine!!
Soundlinx and Connects2 is the same box just diff label on the front, the VAU01DIS is for the CAR200/300/400/CDR500 and is the same as the DOPS004
The VAU02DIS is for the CAR2003/2004/CCR2006/CDR2005
Funily enough 5 mins after my e-mail the soundlinx website was updated and the ref to the CCRT700 was removed, not a lot of cop as ive p1ssed £150 up the wall!!!