You will be fine with the Woods. Most 3 pt implements are fairly universal, just size it to your tractor.
The 5 ft will be the right size for the CK30. Post some pics of it in action when you get it.
I plan to buy a used 60" woods backblade for my 2008 ck30.
Are backblades universal? How do i know if it fits my tractor?
Thanks. Ed
I'd go 7' on a scraper blade. It still will pivot all the way round, and gives you better coverage when angled.
A 5' boxblade is probably a better fit than a 6' footer. I pull a 6' BB, it can stop the tractor. Mine is very heavy. Works fine as long as you don't try to take too big a bite.
Blades come in all grades of quality. If you plan to work them hard, get heavier duty.