I finally got tired of the single-sided retractable seat belts that were in my Imp when I bought it. They kept retracting back behind the seats and you couldn't fasten your belt unless the door was open. If you let it loose, it would slam against the door pocket and disappear behind the seat.
I sent away for some new proper ones. My friend Nick was kind enough to supply me with some Sunbeam stickers for the buckles. They look pretty snappy!