Do they sell car covers for 51 Chieftain

Call them. I'm sure they can find you one.

Maybe. I didn't see any though. You might want to call them sand ask, eh.

There are plenty to choose from. Some which are universal to some that are made for your specific vehicle. Also check California Car Covers. Good products.

Several listed on ebay just looked

Check on their website. You can order then pick up in person.

Possible

I think so

Probably

More than likely