jem7vwh- I didn't forget about you

. I looked around this last weekend but couldn't find the spare cable/lock set. If I do find one I'll post back.
You might just buy a coated cable and a lock at the local big-box. It wouldn't have to be anything too fancy/secure, just something that would require tools to defeat.
And as others have said, beware of the cover causing damage. I've stopped using mine except for indoor storage on spotless cars.