What's the spring behind the seat for?

[Jagermeister]

So, I'm stripping my '72 K5, getting it ready for paint, and I've come to the long spring located behind the driver's seat. I'm trying to decide if I should remove it and fill the holes, or leave it in and paint the hooks. I have no idea what it is for. The PO put in Corbeau seats, so maybe it had something to do with the stock seats? Anyway, I'd appreciate it if someone can tell me the purpose of the spring, so I can decide if I want to keep it. Thanks.