I have just de-rusted and painted what I hoped would be a replacement stand for my CB400F2 whose current stand has developed a crack meaning I can't use it until it's welded up again. I've had this issue on a CB250N so I thought having a spare would also be a good idea. After all the work of taking off the exhausts so I could struggle with the spring (is there an easy way) to get the stand off I find it ....doesn't fit.

Did the CB400F and F2 have different stands?
The shiny newish looking stand in the images is the one I acquired on ebay sold as a stand for a CB400F. In one image you'll see my current stand with the split arrowed. The current one has room for a sleeve to be fitted, the new one does not.
Any idea what I might have on my hands so I can flog it myself?