BIG D 57

http://cgi.ebay.com/ebaymotors/Yamaha-Rhino-YXR660-Cargo-Cover-Plastic-SSV-5UG16-_W0QQcmdZViewItemQQhashZitem483d094d51QQitemZ310261665105QQptZMotorsQ5fATVQ5fPartsQ5fAccessories

I found a pretty good deal on a OEM Yamaha bed cover, it's $50.00, New they are around $300. It does not come with the support struts, but you can find some at the hardware store for pretty cheap, But everything else is there.....I think this is what you are looking for?????
Hope this helps..

thank you for looking but it fits a 660 i have a 700 i am cking to see if beds are the same, will let you know

same bed on all rhinos.
the first year or 2 they was plastic then they started making the metal but still the same size.

Yes, The 450/660/700 all have the same bed.