seat pretensioner question

hi,
I bought a set of leather seats for my 56 plate z4. The seatbelt pretensioners were removed...no big deal i thought, i'll use the ones off my cloth seats. Switched the driver seat over no problems, then went to fit passenger side and for some reason the wire that goes into the seat is different....confused . com???
the yellow connector box thingy is the same, but the connector for the wire that actually goes into the seat base is different..
1st picture my seat with grey cable. 2nd picture is seat i bought with black bow thing

Now the seller is ignoring my emails, but is however still trying to sell the pretensioners out the seats, on ebay :( :( :( :(

Can anyone advise why the connectors would be different,,and how i can resolve this..

cheers guys


 
Do you know what model year car the seats were from? I don't recall there being a change of connector, but I guess it's possible...
 
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