The Bullet Board

The ad says it fits a Classic, but not a 2011 B5. Could this fit a B5?
https://www.ebay.com/itm/194496333718?e ... SwT09hiX2Y

No chance, The B5 and C5 frames are different.

My B5 has the two upright threads that use the nuts that are the BS Whitworth size. Then there's the vertical tabs in the rear that use the bolt and nut. It's impossible to tell by the pictures in the ads what the seats are good for on what frame. Thanks, for the heads up.