I have some new rear Cannondale rear racks in the attic. Purchased from Bikewagon about 10 years ago. I should have one on a bike somewhere but don't remember what bike. Will look for one.
Here's what the rack looks like, mounted on my 1993 M800. I haven't gotten around to checking to see if I have one on a touring frame but I think it would fit fine. They are stamped 25 kg weight limit I think, but look to be plenty sturdy. I haven't been to the attic but I think there's still a new one up there. If not I can part with the one on the M800.
$40 + shipping OK? As I recall they are not branded. Bikewagon no longer has them in stock but they do have the front mount listed on eBay for 99 cents. I took their word for them being Cannondale as they are a dealer. I purchased the racks in 2013 so they are probably a bit older.