Aero large metal zippers - 31/32" long - any ideas??

[Dawn Escott]

I've inherited about 30/40 heavy duty metal zips made by Aero in the UK. I'd brought them home to use them before realising how long they were.

Before I list them for sale. amy ideas as to what they would have been used for? I'm wondering whether it might be bike leathers or upholstery. Thanks