[W126 Coupe] passenger seat belt extender 1991 560 sec

[Gary]

i need the extender for a 91 560 sec.  i broke the plastic tip of the extender that hands you the seat belt.  where can i get one?  can i just replace the plastic arm part?  i was looking at it and doesn't look like the plastic are comes off.  
i took one off an 88 560 sec but the electrical connections are different, plus the tip was also broken.  so i guess it has to be a 1991 part?  you help is appreciated.
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